Why don't Mods stick a post advising user to join their Lemmy/Kbin instances?

I see reddit literally forcing their hand to have the subreddits open, but that hasn't stopped a couple of them from going NSFW or just malicious compliance. What better way to maliciously comply than to send their users to a decentralized competitor? I mean, they'd have to pony up to get it up and running, but that's nothing...