PeerTube is a useful form of decentralization. Each video is stored on its home site, but playout is distributed by making the browsers of people watching it share the streaming load. So if your video on your tiny PeerTube-connected site goes viral, your tiny site will not overload. All the viewers become redistribution nodes. At least in theory, this scales. The highest view count I can find on PeerTube is around 5K recent, not concurrent, views.

I put technical videos on Hardlimit on PeerTube, because Google's ads are annoying and I don't need "discovery" or "followers". The videos are linked from discussions and papers. This works fine, but is not the usual use case, where people are seeking fame, fortune, or at least attention.