Your idea obviously results in fragmentation, isolation, and echo chambers, instead of censorship resistance

Dig into "Kanye's would need to be pretty beefy" and answer your own question. ;) Scale requirements are a constant on the web. One great thing about Pubky is it has a key-based discovery method, so you can safely include centralized servers into the design. If you get censored, you just change your DNS to a new provider or self-hosting. No loss of context.

it doesn't answer my question. for the Kanye's of the world, they can R&D performance and scaling features that help them meet their own ruinious popularity. for 99% of the rest of humanity, home-scale personal servers will be just fine. and people can form comparatively small networks between themselves with no peoblem. the mildly more popular can throw a few extra bucks at their setups.