I've come across a few YouTube users who have "re-uploaded" videos from my channel to their channel (Not favorited, flat out completely downloaded and re-uploaded). I understand that this is gonna happen with all the software that exists to download vids from YouTube, but my rant is: WHY DO PEOPLE DO THAT?!?!
If you like the video, FAVORITE IT! If the original poster deletes his/her video or account altogether, then that's how they want it. Respect that. You know what I'm sayin'? My problem with it is the fact that pirated uploads take away hits and possible channel subs from the original posters. We don't get paid for what we do, but what encourages most of us to keep posting is all the comments, subscribers, and video hits we get.
So please.. If you like a video on YouTube, please don't steal it and re-upload it. FAVORITE IT. That's why the feature exists...