My point is that it not everyone (newcomers especially) would know about various Fedi instances having a blocklist and some even blocking much popular instances. You are assuming that they would at least read usually large list of blocklist or admins even share the blocklist in the first place and check to see if it doesn’t block the instance which has the user they want to follow and interact with.
There’s Fedi.Directory which you pick whatever category of your interest and it list various Fedi account. It’s mostly Mastodon based-account but you get couple other non-mastodon account like PeerTube for example