Windows is made by Microsoft. Would you feel better if people called Starfield a “Microsoft exclusive”?
Linux runs Starfield with no problems. If it’s on a computer and doesn’t use restrictive DRM to control how and under which circumstances you run the software, it’s not an exclusive. Microsoft doesn’t have exclusives anymore, which is a giant pro-consumer move that doesn’t get enough applause in the gaming community. That doesn’t mean they need to develop stuff for one specific DRM box owned by their biggest competitor to be “anti-exclusive”.
Linux only runs it through a translation layer, Proton, it doesn’t run it natively.
Would you also not call Pokémon an exclusive just because technically it can run on a pc?
Pokémon is an exclusive because you have to pirate it / break the console’s DRM to play it on PC. Also, Proton and Wine are explicitly not emulators - that’s actually what WINE stands for (Wine Is Not an Emulator). Starfield is natively available for more than one platform and not only does the Proton compatibility layer handle it but it’s being sold on Valve’s store and the top played game on the completely Windows-free Deck. Games that are released on one console and PC aren’t exclusives. God of War just isn’t on xbox and Starfield just isn’t on Playstation.
Do you need to buy a console to play it legally? If no, it’s not a game exclusive to that console. I have a PC. I can’t play exclusives like Demons Souls Remake without buying Sony’s $500 DRM machine. I can play non-exclusives like Starfield without buying Microsoft’s $300 DRM machine.