Ooh that looks interesting. Not sure that I like that it would take every video you like on youtube. There's stuff I like on youtube, but not enough to donate to, even micro stuff.
Well, the automatic donations to videos you like is optional. There are browser extensions for Flattr which allow you to donate independently of likes which is very useful since many videos on youtube are not uploaded by their original creators but other people who I don't want to donate money.