I lurked there for several months, until I realized the community there sucks ass. It's unbelievable how hivemind-y the entire place is, and nearly every subreddit is terrible. The "gaming" one especially is laughable and quite possibly one of the worst gaming communities I've been to, and I've been to GameFAQs and Kotaku so that's saying something. The only thing I really use it for now is to hop in and look at top world news-type posts. I steer clear of the community.
The fact they arbitrarily decided to ban a bunch of big-name websites doesn't strike me as particularly surprising.
EDIT: So they did it because of spamming. Not a bad policy, after all. I believe they had an issue some time ago with random one-post accounts only posting "veterans coming home" videos for some strange reason.
Suggesting that GAF isn't "hivemind-y" about certain things is ridiculous. In my experience, reddit is no different.