Activision is by far the most evil. EA used to be horrible, but since 2006 and under new leadership, EA have improved drastically. They're bringing in new IP's, they're releasing much more and putting a lot more attention to detail in their things.
Oh and "EA destroyed many good gaming companies and vave is their next target we must stop them!"
How incorrect you are. EA did assimulate many gaming companies, but they never destroyed any of them. For every single one they bought, they always kept the talent and just created bigger divisions where the talent from one company could work alongside the talent from another.
EA got it wrong simply because they churned out too much without a care and weren't too fussed.
EA have turned it around drastically now. John Riccitiello is probably the biggest reason behind this. He's doing a lot for gaming by moving EA from the stagnant water they were in, having them try new things - this is what the gaming industry should be doing.
Infact, here's something from 08. The head honcho of EA admitted mistakes
http://kotaku.com/354350/riccitiello-on-how-not-to-blow-it-the-ea-way
Try say EA are evil now then. Because it's a simple fact that under new management, they're trying their hardest to breathe new life into gaming.
Now the reason Activision are evil.
Here it is, and it's easy to find from a variety of sources.
?[we wont pick up games that] don?t have the potential to be exploited every year on every platform with clear sequel potential and have the potential to become $100 million dollar franchises. ? I think, generally, our strategy has been to focus? on the products that have those attributes and characteristics, the products that we know [that] if we release them today, we?ll be working on them 10 years from now.?
http://arstechnica.com/gaming/news/2008/11/activision-if-we-cant-run-a-game-into-the-ground-we-dont-want-it.ars
http://multiplayerblog.mtv.com/2008/11/05/why-activision-let-go-of-ghostbusters-and-50-cent-games/
links as well there.
Activision are all that are evil in Gaming now.