nostr:npub1440puskfgrqlcj66kynwsgmy86ddjltjgfc48f5fxj8m8rhgyl2qh4zmpe Perhaps that explains it?

But also: "Existing users who allow messages requests from everyone will be migrated to this new setting, but can switch back at any time."

https://help.twitter.com/en/using-twitter/direct-messages