As Seirdy notes:
It just keeps getting more relevant. WhatsApp, GitHub, Twitter, Reddit…each disaster worse than the last. The companies in charge know that the users will just take it after having their autonomy taken first.
Asia is like Line, and maybe some other Chinese apps that I will never install.
The interesting part is, email is still working fine as alternative. I didn’t install any other message app cause email and whatever next iteration of gchat for me is enough. ( I will probably slowly migrate to proton email and some 3rd party cloud storage hosting instead of just use gmail and google drive for photos.)
But yeah, for the less tech oriented population, overcome the hurdle of use different app is really huge obstacles. (Like my mom still tries to share things with me through Line app, even though I teach her how to use email a couple times. it made search for older shares much easier.)
Give your mam Deltachat, it uses good old email. It was a miracle for me, so that with people friends that didn’t want to use xmpp or matrix I just use email thanks to Deltachat. Some of them even installed it and like it so far. Everybody has an email so I can reach plenty of people with DC.