The problem is simply what's defined as being "toxic" behavior, after all it tends to be highly subjective. In many cases it seems to me that you have a lot of easily offended politically correct types trying to enforce their personal morality on everyone else, and declaring things they don't like "toxic" or in some way wrong.
To put this into context, let's take "trolling" in MMOs, which is pretty much people sitting around in zone chat saying "rude" and "offensive" things. For the most part this kind of thing tends to be entertaining for everyone involved, and it generally occurs because of a lot of people being in a zone, all involved in repetitive activities, waiting for spawns, waiting for activities, etc... and the chat is what keeps them occupied. As a general rule a "good" troll tends to be rather funny in what they do and is actually a boon to the community by keeping people entertained. It's actually pretty bloody rare when you'll see a community, or even most of a zone population, getting upset about someone "being a troll". Typically the biggest complaints are when people recycle the same gimmicks too many times or whatever. Usually you find it's one or two people that somehow get offended by a "Troll" "going too far" or hitting some nerve or addressing a topic they feel "nobody should make light of, ever", with these people of course being too thick to just hit their ignore button.
To put things into context the "infamous" Barrens Chat became what it was because it was an oversized zone people in WoW playing Horde had to spend a disproportionate amount of time in while leveling, and which was also part of a big hub that even high level players would need to pass through (especially to begin with) on their way to do other quests and such. Ratchet for example figures into a number of relatively high level quests. Add to this a few things like a rare "unique appearance" cat that could be tamed by a hunter (old school) leading to hunters sometimes camping days waiting for the spawn... and well... needless to say the trolling and jokes flew fast and furious, and for the most part the whole "I survived Barrens Chat" thing was said fondly, and most serious WoW players wind up with a fondness for the area, and some even pop in to "troll" specifically to help entertain those still doing the grind, with it being appreciated by the community at large.
Of course at the same time, there is no such thing as a "five minute rule" in MMO chat, which is to say that before you comment or leap to any wild decisions you should listen to a conversation for at least five minutes in order to understand context (which on forums should be extended to people reading every message in a exchange before commenting to see if what they are saying is redundant or has already been covered within the thread). As a result it seems a lot of the biggest "complaints" against trolls are misfires with people not really "getting" the schtick due to just wandering into the zone and not getting the rest of a routine that might have been going on half an hour before they arrived.
In RIFT for example when I was waiting in PVP queues (I don't play much) there was this guy using the name "Bloodytampon" who would show up and make gross and politically incorrect jokes all the time. He was kind of funny, and the name itself should tell you exactly how serious he was and what his schtick was. He was sometimes in zone chat with a female dwarf beastmaster named Pooksy or something that claimed she married her pig... and you can guess where that went at times.
The point here is that a good "Troll" can be a huge boon to a game when done right, and really the easily offended do have that /ignore command, and if your concerned about a number of people on your ignore list, a lot of these guys don't exactly need to be there permanently, since context should be obvious to anyone with half a brain.
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When it comes to player harassment that goes beyond the above, typically that has little to do with the players and is the result of bad game design. Basically if you have a group of people genuinely "griefing" other players in ways that can interfere with their gameplay (ie not just chatter that can be ignored) that's because the game itself is broken. The Devs then have to decide to fix the problem ASAP, or if they can't, whether to let it go or start actually policing the behavior. Basically if you create an MMO with open PVP for example, one shouldn't get all upset if you have a group of players who do nothing but sit around and prevent other players from doing quests and such and trying to lock them into specific areas/corner them at spawn points/etc... because that is exactly what the game environment that was created encourages. The Devs can't hand that off on the players and claim they are ruining their game or anything of the sort, it's up to the Devs to correct that. If people leave the game, it's going to be because of the design, not the players doing the griefing per se since they were simply a symptom of the problem.
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When it comes to "E-Sports" and MOBA games and the like, a big part of the problem is that the companies running them love the money and fame that come from these kinds of games, and the attention they get for being so competitive, but they don't actually want to put the money or manpower into taking them seriously. You wind up with all of the worst aspects of sports, with few of the benefits. The bottom line tends to be that the companies wind up needing the pool of players who all want to act like out of control big-shot dillweeds, and thus are very limited on what they can do to enforce the rules on them, because there are only so many draws in a very limited pool of players. What's more you start banning people that might have hundreds of thousands of followers, and they take their fans with them, and you lose a lot of revenue. This is why it takes something really beyond the pale to get action taken, and really it can be argued that when E-sports companies do take action it winds up hurting them as much as the guys they take action on (and understanding this is why the behavior largely persists).
To be honest, I don't think E-sports will really take off until it becomes a lot dirtier as far as management is concerned... along with other things. If you've ever followed the early days of sports, or how messy a lot of amateur sports on their way to becoming big have been, you sort of understand it. Even sports that became legitimate wound up needing the gangsters and such to get started, in part because it was a way to keep the talent in line and adjust attitudes without losing it. If your a limited sport or venue, with only a few (comparatively speaking) names that are beginning to draw people in, and some of those people are jerks that can do damage to the business as it develops, you didn't regulate them, you sent Vinnie and Luigi to do a job on their girlfriend, family members, or whatever (you don't want to damage the talent itself) as a message to chill out, but keep performing, or else bad things happen. Once sports got bigger and there were enough draws, regulation became more viable, because at the end of the day people losing tens of millions of dollars is a huge deterrant, and if it's not, there is more than one superstar, so while the fans might be upset, given enough time todays "super athlete" that disappears in a scandal is tomorrow's "where are they now" story. Of course behind the NFL, NBA, Boxing, etc... were all kinds of micro-venues to begin with, and behind them were people who kept the Vinnies and Luigis around. Some people will of course be saying "wow, Theru, your screwed up and warped" but the point is that this was all part of the process.... and it's also why I don't think this problem will ever be dealt with or that E-sports will evolve in the near future, you don't have the vision, ruthlessness, and willpower, behind it. Not one gaming company seems to keep a slush fund around for shipping muscle internationally to take care of business as an open secret. Not one of these "toxic gamers" who has done something to impact the sport
has come down with an accident tragically busting both ankles (they don't need their ankles to work a mouse & keyboard or a controller). At the end of the day people are content where it is now, the companies are making money they are largely happy with, and letting "Cyber athletes" and well known personalities behave like "Team Siren" is just part of the equasion... and that's where I think the original article is coming from, you get people that dedicated, and a community persistant enough to notice the attitude and care, and it's a good thing, as chances are it means the bank
is just going to come rolling in.
That's my thoughts on a wide range of "toxic behavior". For the most part I don't see it as a problem. But then again I'm pretty thick skinned, and can zone it out. What's more I do my part, I haven't had a chance yet (busy) but I made a character called "Dominar Gorean" to goof off with in STO, he's a male Orion pirate, and I figured I'd have him run around making exaggerated "Gor style" anti-feminist comments and encouraging gender slavery (which is actually kind of Canon for Trek... Orions have been depicted numerous ways, and even if you use the matriarchal definition one could say a free male running his own ship might have issues)... purely IC RP of course for the laughs. Of course, while 99% of the people will probably get it and laugh along with it (especially if it's clearly at least quasi-RP) all it takes is that one special person who decides to take it seriously and get offended... and that's usually where the "toxic" complaints come from. I'm not the only one who occasionally does something like this for fun.