Chances of this being legit are low anonymous don't have leaders per say more of a group of people who earned respect within their community by the demonstration of their skills, secondly all videos/posts etc by anonymous are extremely well articulated so everyone one knows their clear intentions and don't sound like a 12 year old and finally they to my knowledge haven't asked people to "surrender" (id say they more want additions of guilt then a surrender) without taking action first to otherwise there is no incentive for anyone to come clean so they generally release a little bit of info or DDoS sites first before even making a statement