Personally I see no benefit in having them in the same application.

There is always SMS for these.

There you go, mate. https://archive.is/2025.01.30-220414/https://www.404media.co/zuckerberg-says-everything-i-say-leaks-in-leaked-meeting-audio/

Sadly look at email. Technically you can host it yourself but if you’re not one of the 15 or so big providers, good luck not being marked as spam before you even do anything.

The real problem is with the oligarchy controlling everything, service or protocol. This is why Threads was/is dangerous.