It's used by a lot of the big commercial platforms because it's well understood and has libraries for every system and language ever invented just about. Eg. Zo

It's used by a lot of the big commercial platforms because it's well understood and has libraries for every system and language ever invented just about. Eg. Zoom and Jitsi both use XMPP (Zoom for Chat, Jitsi for chat and signaling), WhatsApp used to just have their entire backend be an off the shelf XMPP server, Cisco Jabber which is still popular in "enterprise" uses it, etc. And for other individuals just wanting to talk with their parents it's just a chat app, they don't care if it's XMPP or not, Conversations is just really nice to use.