The last ‘release’ on github is alpha 3, in 2020. It’s dead.
Bottles is as gaming oriented as PlayonLinux. They are both just Wine front ends and prefix managers, it’s just that PlayonLinux is dead.
There’s nothing about Bottles, Lutris or even Steam that makes them only for games. Proton hands things in ways that will make it the easiest way to get things, not just games, running. They are just front ends to runners.