@LMAO is flooding the site with random communities because they’re salty about being banned for claiming too many community names. They claim they’re trying to “fuck your entire site up” but I imagine it’s a relatively quick fix to delete all the communities they’re creating, LMAO.
The instance owner/admins are in charge of that. They’re kind of equivalent to the Reddit admins, except if you don’t like the instance admins you can go to a different Lemmy instance but you can’t move to a new Reddit instance. Also, community names are unique to each instance, so !support@lemmy.world and !support@lemm.ee share the same name but are two separate communities in two separate instances.
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Basically, this guy was spamming communities not instances. Basically he spammed a ton of subreddits. The guys who run the instance are above him and can just ban him and delete all of his communities.