There is "block instance" under "settings > blocks" but what does it do? I added a few onto the list but it seems does nothing to remove contents links to the instance.
What I want to achieve is to block all users post from specific instances when spams are high.
Hmm I guess not I just saw that behaviour. It probably just blocks the posts on that instance no matter who posted it, but not the users who can be free to post somewhere else.
So if there is an instance about, for example, AI gen that you dont care for you can block that instance instead of every community on that instance individually, but the users of that instance might post about OSS or something on another instance which you then would see.
Out of curiosity what spam are you talking about?
odd stuff should be taken care of by the admins though they gotta defederate instances that have poor spam control