That doesn't sound like it's an incredibly difficult problem to solve from a technical standpoint, if the creator is the one being hit. Just need either a software package -- or, if the limitation here is content creator bandwidth, service -- that pushes a video to multiple streaming video providers.
Might be an issue for third-parties creating mirrors of YouTube content, though.
Yep thats whats happening here by the sound of it. TILVids is a very small instance that shares donated $$ with their creators. Its a very good way to try and keep creators on the platform.
What are some good larger/general purpose peer tube instances? Last time I checked tilvids was one of the largest I found, so I seem to have missed a lot.