Wikimedia, Archive.org and personal domains I htink cover like 90% of my use cases I think. Of course https://video.fosdem.org or a specific agreed upon mirror like the OSUOSL site would be good at the moment.
For all the hype of Peertube; im personally passing on peertube at the moment. I like the idea of distributing this content via bittorrent to scale bandwidth and related issues; but the whole rest of the peertube scene im not sure is for me. The server software looks far more complex and heavy than I typically like to host or maintain. Im not sure duplicating youtube UI and comment culture are goals im invested in; etc.
MediaGoblin is an alternative in that space that is working on ActivityPub federation too worth keeping an eye on; but again; a lot of complexity (to me anyway) on the back end.
Im currently thinking I kinda prefer embedding bog standard web video in things like discourse or elsewhere for the time being.