I agree that F-Droid is great!
What I usually do is to buy the pro version on Google Play and install it later on F-Droid.
On the other hand I don't see anything wrong for non tech people to install FOSS apps from the Play Store. The apps are still FOSS
Startet using Linux in 1999. Then I did a lot of distro hopping:
NixOS feels very contemporary and will stay a while. It is very advanced and usable in many diverse environments. In the past I did learn a lot installing and maintaining Debian and Arch – which has a great community.
Another NixOS user.
Foot is the fastest and I use it as default. Second is Kitty because it uses GPU acceleration.