I want to own my group messages // FB Messenger *shudder*

I have friends who uses Facebook Messenger… exclusively.

Sure, I can SMS them if I was having a one-on-one conversation, but if I wanted to initiate a group chat, I’d have to load up the dreaded F app (well, their messenger app, but still dreaded).
Of course, I refuse to do that, I so load up Facebook on Safari, force it to load in desktop mode (because FB won’t let you open FB messenger via a browser on mobile 😠), and open up messenger that way.

It’s not hard to understand that my interactions with these people have dropped to nearly zero.

I want to encourage these friends to move their conversations off the FB platform, but then I realise that there really aren’t many alternatives.
iMessage would be my preference, but I have Android friends…
There’s WhatsApp, but that’s owned by Facebook, so what’s the point? (Unfortunately this is the second preferred platform amongst my friends)
Line seems the best bet (only because I haven’t read any damaging reports), but even that’s a silo.

I didn’t realise it, but by owning my own blog and getting into the Indieweb, I now want to own all my content, including my messages and I’m sad that I can’t.
(I know there’s email, but can you imagine trying to convince a friend – who exclusively uses FB – to use email to organise a group dinner?)