Ya I see this advice often. "If they do that change apps then just stop talking to them". They don't even realize they sound like the crazy one constantly asking people to change apps.

I use Signal the most simply because that's the app I can get most people to actually install that is the safest. And I still have friends that refuse to use it and will only message me on Discord. I'm not going to drop my friends simply because I care about privacy and they don't.