Ultimate Guitar is not one person, but another site that hosts tabs. I've found LOTS of bad transciptions with that annoying little "Ultimate-Guitar.Com ©" at the bottom. Personally, I cringe when I see it since there's so much laziness displayed in the work: not always, but in general, they suck. And as to their copyright claim, WTF? How can an accurate transcription of someone else's music be copyrighted by another musician!?
Well, it would be nice to have a flagging system to flag inaccurate work for review. Digg-esque, if you will. And a button for flagging duplicates (not simply alternative transcriptions.)