This is why outside of complete madlads intentionally subscribing to everything, instances only pull in communities that at least one user on the instance have subscribed to

The cache still lives on even after blocking, outside of direct admin intervention. Beehaw.org still has everything from users on sh.itjust.works and lemmy.world up till the block, and now the cache is stale.

EDIT: Just tried going to lemmy.directory. Unsurprisingly, their server crashed xD