Valve still uses Ubuntu as it’s base for it’s Linux game runtimes. Dev’s are encouraged to use it for developing Linux games, since it guarantees specific dependencies being available. This runtime is a container which comes with Steam and works on any distro.
Valve basically solved Linux problem with too many distros with different deps.
Some gamepad player are really good. Especially in Overwatch, which has characters like Mercy, Moira or Reinhardt that can provide value even without good aim.
Though Overwatch doesn’t have aim assist on pc, so it’s probably difficult even for most experienced gamepad players.
That won’t work since Valve doesn’t want to bake such software into SteamOS.
My guess is that they’ll use FaceIt AC as a server side component to detect cheaters.