Jesus Christ, how can it be that bad? Their servers are running Windows, right? I don't see how Nvidia's coverage can be that bad unless they're encumbered by licensing quirks. Even Valve's Proton manages to cover ~75-77% of the Steam store's titles...
It's notable that legally Firaxis (and the other sleazy scumbags) largely have no legal basis, but nvidia decided not to make enemies and let them do this.
As a result, I have bought no additional Civ expansions, and will never buy another Firaxis game.
Presumably that is covered by this part of the EULA:
>You agree not to, and not to provide guidance or instruction to any other individual or entity on how to:
>except as otherwise specifically provided by the Software or this Agreement, use or install the Software (or permit others to do same) on a network, for on-line use, or on more than one computer or gaming unit at the same time;