I don't mod any communities but I do put in the effort to curate my "All" feed and most of the users & communities I block come from those 2 instances. Toss hexbear on there and that’s almost 100%.
I specifically avoid all three of them as well, along with Beehaw.
In the U.S., this kind of hypocrisy is so common that people apparently no longer notice it -- if they even did in the first place.