Blocking communities doesn't work at all - sh.itjust.works

So I’ve been attempting to block communities I don’t want to see on my main feed, but it’s pretty much impossible to do these days because the communities get mirrored on so many different instances that when you block one single community 5 times, there are still 3 more versions on different instances with the exact same crap. Block them? There’s still more! This site is rapidly becoming completely useless, the way I’ve been using it before.