I'm seeing a lot of people call Hexbear a tankie instance lately - they aren't really though, they are an instance full of trolls who are militant against any belief system at all (most especially their own?), or as near to that as makes no difference. They constantly lie - most especially to one another, and have even been caught lying to other instance admins.
I would lump Hexbear in under a name like The Big Three (to block), but I just thought I'd point out that many people are going to argue at its being called specifically a "tankie" one. And ofc it's more than just these three - e.g. Midwest.social has been caught in numerous scandals as well, though unlike the Big Three, the actual users there are perfectly fine, so I don't advocate for blocking it, just avoiding the communities there.
Speaking of, the Lemmy "instance blocking" would have been much better named as a "community mute", since it allows you to see the users from that instance, and they can vote on and reply to your content, triggering notifications, etc. The only real way to do an actual instance block is to move to an instance that has defederated from it (requires admin rights), or use PieFed that can implement a true user block from any instance you ask for (no admin approval necessary), or the Lemmy apps Sync and Connect can likewise do that.
True, but those users on the Big Three are fairly reputable for being contentious. So much so that merely blocking Hexbear alone will improve someone's experience on the Fediverse by ~90%, and then if you are able to block Lemmy.ml (most people using Lemmy cannot, not truly) then that improves it by a still further 90%.
Put another way, yes it blocks too much - that much is sadly true - however when the vast majority of the most batshit insane comments that one sees across the entire Fediverse comes from a user on one of the Big Three instances, then rather than leave the Fediverse entirely to get away from such, it makes a helluva lot of sense to just block users from those instances (which again, most people on Lemmy really can't do, without going to extreme measures).
It's like email spam: what legitimate content are you willing to give up in order to block the vast majority of incoming stuff that you don't want to see? There's enough leftover after blocking it out, at least for me and many others say the same. It does kinda suck for users on those instances, but like... at this point it's very well known, and they've made their choice, so now all that remains is for me to make mine, and my preferences - to avoid nonconsensual insanity thrown at me relentlessly from an instance that not only fails to discourage such but sometimes actively encourages it - should be able to matter too!