newly signed-up user for berserker.town just DMed me to tell me why they turned around in the door and left again, and mentioned blocks from:
techhub.social
universeodon.com
mastodon.art
mstdn.party
mas.to
toot.community
peoplemaking.games
musician.social
linux.social
social.linux.pizza
mastodon.scott
mastodonapp.uk
mastodon.ie
toot.wales
based on the reasons for blocking sometimes being very specific, they said it sounded credible, and that i'm probably just a crap admin.
all i can say is that there's been a couple of cases where i've suspended users for abusive behaviour.
there have also been hundreds of reports against users who have expressed unpopular opinions or attitudes that i have closed without action, because those are allowed here.
it's very socially costly for an instance owner to allow it. a big number of instances are censoring people whose attitudes they don't like.
i can produce a much longer list of instances that happily federate with us though. it's just that some surprisingly big names on the Fediverse don't tolerate certain topics.
a surprising number of users will also report people if they're losing a heated debate, as a form of revenge, and if the admin sides with the reporting user on the issue, this often results in a block. i personally object to this kind of mentality where a debate on a topic is only permitted if you take the side that the admin takes. that's not real debate. that's just "tralala i only hear what i want to hear, you're blocked now"