I was wondering what was causing all these 500 Server Error iFrames to show up all over the web. This is exactly why I oppose our current system of copyright laws. There's no legal way to mirror a lot of the really unique, rich content that's on YouTube and, if one day that content creator decides to delete it off YouTube, we might lose large pieces of internet history forever and just flat-out break sites that are embedding that content.
Scary thought...
That's why we need IPFS, blockchain and all kind of decentralized system. Watch DTube meanwhile https://d.tube/
PeerTube is also worth a mention. They just released 1.0.0. so now's a good time to evaluate it.