Yup. Matrix and Jabber are what’s left. Sadly, all of the US is on iMessage, locking us not only into proprietary chat, but proprietary hardware to run the proprietary chat. I don’t really like my iPhone, but I bridge iMessage to my Matrix server, and as soon as I switch to Android, my iMessage account turns into email address only and I’m locked out. I’ve honestly considered paying for a phone line to an iPhone that stays plugged in at home, to free me to use whatever other phone I want to. That’s how far we’ve fallen.