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FYI, lots of users are polling to defederate sh.itjust.works
(lemmyonline.com)
Home of the sh.itjust.works instance.
To be fair, lemmygrad was blocked since pretty much day 1, largely because a number of other instances did as well. Exploding heads is a more recent thing, and that was after the agora was set up and the community is still figuring out what policies the instance should have.
I'm guessing exploding heads may be defederated as well, but it may take a few days to decide.