This is how the end begins, folks. This is a group with no friends in government, in business... in short, the people with money. The people who can afford the best stuff, and to hire the best people. Everything leaves a trace, everything leaves a trail, and sooner or later enough pressure, power, and money can track down anyone with a web presence.
But Anon? They won't care. Many of those who call themselves Anons or use their tactics can't even imagine there is a backlash to be had. They'll hear this and think 'Ha! We'll just screw with NATO next! We'll screw with everyone! Onward, for lulz!'. Meanwhile, others use the Anon banner to attack governments, to aid rebelions, to fight for transparency in government and business and for free speech to be available for all. This combination leads the outside observer to think they are anarchic madmen. And the last time anarchic madmen went unchecked, we had World War I.
My advice, personally, would be for folks in Anon to find a new mask to wear and fast. Sooner or later, someone wearing your mask will take one step over the line; crash power in an emergency zone, scramble hospital records so people get the wrong drugs and die, or so forth. That person will, likely, see no difference in their actions and the usual lulz they think Anon is all about. And that will be the day these governments go from being curious, concerned, and interested to deciding to track people down and toss them in prison for a few decades. At best. And when it comes to it, motivate the politicians and businesses enough, the ideas of free speech and protection of clients will go bye-bye.
That's the part I find most amusing about this. That which many of those wearing the mask fight for, most likely, will ultimately be eroded, even destroyed, in part thanks to the actions of others wearing the mask. It's ironic, but only in the sense that being gut shot when you were worried about a stomach ache is ironic. This will, ultimately, end in fire.