If you dislike how lemmy.world is being run so much, why don’t you pick different instance, or create your own instance, or go back to Reddit, or take up a different hobby?
You seem technically skilled. You can start cm0002.world and power trip however you want.
Looks like you got site banned, bud. Maybe they had enough of you making shitposts about how lemmy.world should defederate from lemmy.ml. I know I’m tired of seeing them.
Maybe your shitposting about lemmy.ml while at the same time reposting lemmy.ml’s memes to lemmy.world was the last straw. Is shit-stirring inter-Lemmy drama really what you want to be doing with your life?
Only admins can do site bans. What you’re seeing is a hacky/temporary feature of the upcoming Lemmy v19.4, of which lemmy.ml is running the pre-release: when an admin bans someone from the site (temp or otherwise), it also automatically bans them from any community they have ever participated in. Lemmy.ml has always been the “beta” instance for new releases.
That must have happened with an alt account, because it wasn’t this one: https://sh.itjust.works/modlog?actionType=All&userId=16390800