The users expected to set up servers should be tech-savvy people (not necessarily with any programming experience) wanting to do something for their online and offline communities. This should be like hosting forums, which is still a thing here and there. Or WordPress.
This infrastructure should be in place when some major event strikes that would drive people from centralized platforms (compare https://news.ycombinator.com/item?id=21480623 ). Of course who knows what will happen. But at least, we should have a durable infrastructure as an alternative to big corporate players, even if only some people will use it in practice.
It would be interesting if Alphabet would support some PeerTube-like initiative at some point, as an anti-antitrust measure.