I've been wondering about the handling of PR / legal / moderation issues on The Fediverse. Surely if it becomes popular, those burdens will fall on the shoulders of well-intentioned volunteers who just wanted to run a server, who will generally be ill-equipped to deal with them? I guess it could be OK if you're running a small invite-only server for people you know, but not sure how it's going to work for larger instances. Which, looking at the history of email, are probably where most people will want to be.
Assuming the fediverse becomes popular enough there will no doubt be large websites that finance themselves with ads/subscriptions.
After all git is a decentralized system as well and big silos like GitHub exist.
Moderation choices themselves would also have geopolitical readings from trading partners. It would be quite touchy.