JustMarkov

No statements about what they log

It's on their main page bruh:

If you use the AmneziaVPN app for a self-hosted VPN, we do not collect any data about you or your server.

If you connect to our services, such as Amnezia Free and Amnezia Premium, we collect only the data necessary for the VPN to function.

4 years is pretty new? How much time should pass by for it to become trustable?

Why tho?

Gnome likes to remove important APIs from time to time which leads to extensions being broken for an awfull long time after an update and also has all sorts of issues with QT apps, simply because Gnome devs do not want to bother with things they consider not important.

What's your issue with KDE?

EDIT: Typos.

KDE is rock solid on my device, unlike Gnome. What do you mean by that exactly?

No, unfortunately. It is just the first thing that came to my mind reading your requirements.

Raspberry Pi 5/400 with Waydroid? Just a thought.

I hope that LadyBird could become a viable alternative as well.

I wanna buy a PostmarketOS compatible device someday.

https://nosystemd.org/

Sorry, I couldn't resist. /j, obviously.

Both have nonfree stuff in there.

But flatpak's backend is open source and self-hostable, while snap's is proprietary and not self-hostable. Flatpak is the lesser of evils from this point of view.