You havent got a Valve source for that because thats a surprising change, I know they dont tend to listen to players if they get banned so its interesting that policy has changed so much.
Well this is confusing as Patcher mentioned them to be most likely once Destiny is out primarily because its a MMO so their might need to be a possible change in pricing structure...
ps3ud0
They quietly brought it in, hence you never hear anyone complaining they've lost access to their library anymore. You can no longer buy or trade stuff etc etc though, VAC bans are just per game now also, but that's your own daft fault if you get hit by that.