I don't think the problem is if signal leaves EU or not.

Odd comment. You may be in a bubble, I may too, they're different bubbles: I do signal with fellow geeks in ietf and related contexts, with family, and newspapers use it rather than telegram for tips. They're in europe.

It didn't get traction in your circuit. It's used heavily by politicians.

I don't know where your here is but where my here is, most of my contacts are on signal and it's probably the main app I use to chat with everyone

All the politicians are using it

Won't that get blocked too? In any event Signal is already quantum-safe and open source and audited.