Yeah, really sad to see this. When Aspyr released Farenheit and KotOR 2 I was really excited for getting more older games ported but it seems they dropped that.
Right, I forgot about those Linux porting companies such as Aspyr and Feral Interactive. And Collabora isn't specifically a gaming company, but they and CodeWeavers also helps
Both Collabora and CodeWeavers collaborate with Valve (and with funding from Valve?) on the gaming front though so it's not wrong to attribute that to Valve (yes CodeWeavers also improves Wine independently, but that's more than just games).
And Collabora: https://www.gamingonlinux.com/2020/10/collabora-expect-their...