Except they don't, and in fact have built a state-of-the-art video and audio recognition system to deal with infringement[1], and of course respond to DMCA takedown requests.
There's plenty of infringement on YouTube, of course, but that's inevitable for any platform where anonymous users can submit media files.
There's plenty of infringement on YouTube, of course, but that's inevitable for any platform where anonymous users can submit media files.
[1] http://en.wikipedia.org/wiki/YouTube#Content_ID