I do it with a gluetun container (more versatile) zero issues, but you can just mainline wireguard as an interface if you prefer, also works fine, on bazzite.

I have bazzite running on my desktop. I use proton VPN on it. No issues. 👈😎

Yup, using openVPN profiles. Proton VPN has quite clear instruction on how to do this on their website. Just do a search for “proton vpn openVPN profile Linux”

I've installed it through secureblue's ujust script. I think this has been the smoothest experience I've had with it on Fedora Atomic.

Previously, I relied on the wireguard profiles I downloaded from ProtonVPN and which I loaded through NetworkManager. While it definitely worked, it was a hassle to redo it every now and then. Furthermore, switching on the go to something else I hadn't loaded already was never an experience I enjoyed doing.

Though, for completeness' sake, ProtonVPN^[Note that, IIRC, IVPN and Mullvad don't fare better in this regard.] hasn't fixed its IP leakage on Linux. And, to my knowledge, the workaround is only available with access to the wireguard profiles. And thus, the cumbersome method actually offers a very tangible merit over the comfortable one.

Finally, while I don't endorse the use of NordVPN, it's the only other VPN that's installable as a sysext. Note that systemd system extensions are still experimental, though. Even if they've (read: N=1) been reliable to use for me.

ProtonVPN works fine for Debian based systems, wish I could say the same for ProtonDrive.

Using FastVPN for 3 years now. It's so great, I probably cost them much more than I pay and they have port forwarding...