Ah, sorry, I misunderstood. I thought you were asking if they had usernames that could be used in lieu of a phone number as a contact.

Yes. For quite a while now.

There will always be echo chambers of idiots. Twitter is more or less that already.

I haven’t seen anything to signal Mozilla is untrustworthy other than from that one right wing guy with a chip on his shoulder.

Never, because Chrome is a data harvesting platform.