While I am also a FOSS evangelist, I don’t get people who insist on open-source games. It feels similar to asking movie makers to publish their Kdenlive or Blender project files.

Sorry for confusion, I meant Lutris and Heroic, not the games.

Do you know if you have installed those through flatpak or not? You can verify this by running flatpak list in a terminal. It would be helpful if you shared the entire output of that command, particularly relevant parts would be about Nvidia drivers.