There is a kernel of truth though. Many communities are organized per instance, so if you want to be part of multiple communities you must register on multiple

There is a kernel of truth though. Many communities are organized per instance, so if you want to be part of multiple communities you must register on multiple instances. You can follow an account, but you can't follow an entire instance and have all toots of everyone there displayed in a timeline on your own instance. Humans are naturally converging towards communities, and Mastodon leaned into that. But it's actually not the right tool, because in the end it's centered around individual accounts. Lemmy is the closest thing to what the author wants I guess.