There are options sure but on my friends case I can see people aren't so eager to leave the most popular applications/networks, the privacy argument is often shunned with classic "I don't have anything to hide" line and often one is "I won't be installing another app on my x/y/z".

But Telegram still seems to be most popular second choice after Messenger and/or WhatsApp - I've seen recently two people joining it out of sudden (perhaps messenger gained traction because of Belarus situation); personally that's my default instant messenger nowadays, while Signal is the backup one. I'd like to move everyone to element/matrix but that's rather impossible to achieve...