Comment by chipotle_coyote

It's the same challenge as picking an email server, which is why no one does that.

...

Seriously, joining Mastodon is not particularly difficult; people just freaked out a few years ago at being asked to pick a server to join. The joinmastodon.org website has gotten a lot better at explaining what that means and just directing people to mastodon.social if they don't want to pick something more specific, but the "oooh, this extra step makes Mastodon super super scary, if you pick wrong YOU ARE DAMNED FOREVERRRRRRRR" vibe persists.