I think this is a kind of meta joke.

Initially I thought this was some kind of actual ban message, then read it again.

Its specifically formatted as if it were for reddit, not lemmy, and they’re not actually a mod here.

So… its a joke aimed at reddit moderation policies.

EDIT:

I should probably add that this did effectively jump-scare me, so, its also successful as basically a prank.

I do not like being pranked, but also… it worked.

So… blegh. lol