I am willing to pay to have Linux support, because right now, Flatpak version does not work and has not worked for sometimes. The reviews have gone ignored, and it doesn't seem like anyone is updating it. I do not use a DEB based distro, rather I use an RPM based distro (Fedora and openSUSE). I do not think you can sell Flatpak, but I imagine you could sell an RPM build here, and I'd happily buy it.