@pfm maybe I'll write about it a bit. The intention was to build a PeerTube instance that only hosted Public Domain / Creative Commons media, and provide captions and donation links and stuff.

The cool thing is that PT instance admins can subscribe to the whole instance, and their local catalog will get populated with all available channels and videos. So, in a way it's a means of syndication, and could be useful for bootstrapping an instance with something to watch.