These reasons given by Roberto @rober for being in #Mastodon seem very sensible to me and I fully agree with them...
(I add a "conceptual" overview of the world of social networks with a zoom of the "island", or country, of proprietary social networks)
https://www.blogpocket.com/en/fedipost/Why-I-choose-to-leave-X-and-stay-at-Mastodon/