Dude no sense in arguing with people about this. There are some intense misunderstandings of reality, deliberately instilled by the big communications companies, that leads to these ideas, even in people who eschew those big ones.

The first, big one is "I don't want to install yet another app." This is silly. You have a device in your pocket, designed for installing apps to primarily communicate with people. It is unreasonable to expect to install one app for everything, to talk to everybody. And that's a nice segway into the next idea.

Communication is about talking to people. Network effects are a thing. If you want to talk to someone, you and them have to use the same tool, protocol or network. You have to have a wide array of tools to do this, it's like speaking more than one language, the more you do the more people you can talk to.

Both of these silly ideas are what keep everyone locked into WhatsApp and whatever. These same ideas are internalized by privacy people, where they expect everyone to use one thing, it has the same effect on them, locking them into something.

You should select a handful of communication tools that will connect you to the most people you can, without compromising a handful of things that are very important to you. For me, independence from a big corporation, FOSS, availability of e2ee and personal identifiers can only be required for tools I use with IRL people. If it meets those criteria I'll use it, I have preferences but I won't make myself unavailable to someone I'd like to talk to beyond those simple criteria.

Not really. I was not even aware their devs were Russian.