do we really have evidence that the problems with a lot of mainstream social media has to do with size? there are shitty smaller sites like for example kiwifarms was vile but not very big. And other sites are expansive like linkedin or quora but pretty benign (if boring) AFAIK.

A lot of people who are comfortable with tech have a hard time remembering how unusual that is. We are all clustered together with each other so it becomes normalized. But think of all the facebook, tik tok, reddit, instagram users int he world. Who will run services for them?

It's all well and good for us nerdy types to say "OK, one out of every few hundred of us is going to run a little server". And we can support that because the % of people who have the skills and resources is extremely high.

For the rest of the population, who is going to put the kind of community cultivation in to setting things up, convincing people to move, orienting users, etc? If this plan was to be viable it would need to have a small army of volunteers to commit to creating instances for specific communities far outside of tech.