nostr:npub1pzr6z8upham57k47gy6xj8y2clvq76xl944y9xsr3dsdn372metqjhjcgr Twitter's Help Center literally says:

"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