This is how I've been communicating for years now, it works fine and does not feed any of the data parasites out there.
This is not just fiction, it is what I have done and am still in the process of doing, in my case moving from Telegram - I never used nor will I ever use things which requires accounts run by metafacebook or Google or Microsoft or any of the others.
You will only be allowed to install "approved" applications, your device, not your choice anymore.
Tox/aTox [0][1] fits that description and both continue to be developed.
> Empower criminals so that they cant use this excuse to target civilian infra.
According to one webinar from CSIAC (2023) [2], XMPP is popular with Tox slowly catching up.
[0]: https://github.com/TokTok/c-toxcore
[1]: https://github.com/evilcorpltd/aTox
[2]: https://csiac.dtic.mil/wp-content/uploads/2023/03/CSIAC-Webi...