On version 0.19 you can block instances so that you don’t see any posts from that instance, instead of having to block communities one by one, you still see comments from users of that instance in other posts so it isn’t completely blocking the instance.
Does the option also block users? That would be bad in this case
I’m honestly not sure. I only just heard that instance blocking was coming with this update. I’m not sure if it’s like defederating (aka complete block) or just blocks their communities or what.