From HN-user whatshisface's comment:

If the reason for "not forcing them to handle content from server Y" is that the admin of server X had a name calling spat with an individual user on server X, the fact that the fediverse makes instance admins into miniature dukes and dutchesses, complete with wars and Honor, is an unalloyed pain. ;-)

I think this user is saying this as a negative but I really think this is an advantage of the Fediverse and an intended consequeunce.

I don't think I'm alone in thinking that I'd rather have dukes and duchesses ruling little fiefdoms in the fediverse over King Zuck, King Spez, King Musk who have full control over their respective network. Each can have their spats over stupid stuff, but in the fiefdom model, with a little technical knowledge you can make a part of the network you have complete rule over, and engage in something akin to diplomacy with the other little fiefdoms.

How utterly delightful, someone fighting the dense diarrhoea that is Meta “transparency”. Random blocks on all of their platforms, users, groups, numbers, fediverse instances, you name it they block it. No reason, no appeal, permablock, and no support email or phone. I wish humanity would start whipping Zuck into some decency.

the author, Alex Gleason, is a notable bigot - he was "chief of technology" for Donald Trump's "truth.social", Gleason's spinster.xyz is the usual anti-trans / nazi-adjacent crossover special, and Soapbox is notorious on Mastodon for being almost entirely used by actual fascists.

blocking his bullshit from Threads is an incredibly rare Facebook W for its users, IMO - although really I wish Alex all the best working around whatever defederation FB is doing, truly he and Mark Zuckerberg are a great match.

Why anybody would want to fetch posts from threads which is full of edgy and disgusting posts?