Why isn't YouTube used as a CDN for video and audio files? Through YouTube's api and developer tools, it would be possible to post all media files to YouTube from a CMS and then make a call to them when needed. This seems like it's within YouTube's TOS, it's a cost-effective way to store, retrieve, and distribute media files, and it could also make for easy monetization.

I ask because I'm working on a new project for a public radio station. I can't figure out the real downside to this sort of an implementation.