i'm a steam fanboy, love the service.
now i don't know all the details, but basically someone with ~1000 owned games was recently banned because they made like 100 alts to farm the coal gift promotion.
yes, it's wrong/messed up, but basically all 1000 of her games are gone, she also had like 6000 screenshots in the cloud gone, and had comments from 2006 in her profile so she's used steam awhile.
she can't login and even play her games offline afaik (if she tries it'll just say you're disabled), so she basically lost all of her games. so she lost her 8k$ in games because a lapse of judgement on the internet.
i know it's in the steam agreement but yeah. really turns me off they couldn't just ban her from going online or something, and she could keep her games. basically valve can own you if they want /w no arbitration, judge/jury/executioner. obviously if you follow the rules there is no reason to worry, but it still turns me off very much.