@PestToast
Actually, scratch everything ive said about this lol, looks like they implemented basically what you want to do in a recent update. https://docs.joinpeertube.org/contribute-architecture?id=redundancy-between-instances you can run a Peertube server and "cache" videos for other servers, allowing your server to seed them for viewers. So yes, what you want to do can be done.
@humanetech @peertube