

While there is quite the push thanks to Valve, they built upon the work of others, mostly Wine (which I think they fund nowadays) and DXVK (they hired the dev after a short while). So they’re definitely not freeloading, but the main lifting has been done by Codeweavers and Wine contributors through their massive work over the years, plus the quantum leap that was DXVK.
I’m not trying to shame Valve here, they definitely go beyond what they’d be required to by license, but I feel it’s also not fair to call them the reason most games work under Linux when others have poured literal years of work into making it possible.
Luckily, it’s not the entire Internet, just the unfun part.