At least since the 90s, Windows has been THE platform for gaming. In 2020, the tools and drivers for Windows are better because its the primary platform.
Linux has been getting slightly better support for several years now, but it has a long way to go.
For example, the latest Ubuntu release supposedly has a ProtonDB update that claims 70% of the Steam Library is rated GOLD or higher for compatibility with Linux.
To a non-technical user that hasn't tried gaming on Linux, that sounds amazing. Its actually a meaningless statement though.
So what is a game rated as "GOLD" or higher?
That basically means it might run fine if you install it, but it alternatively might not even load or run at a playable level if you don't install additional 3rd party tools and/or mess with configuration files. Most people would go back to Windows at that point and never try using Linux again as long as they live unless they worked in a technical field and needed it.
Gold implies good. IMO its not good until I can just click install and reliably play a game after it finishes downloading.
As another example, many of the biggest money making PC games are competitive online games like MOBAs and Shooters. These games can't thrive without a decent anti-cheat solution. Anti-cheat software is frequently implemented at the kernel level. Its difficult to make software like that play nice with translation layers/emulation/whatever of Windows in Linux, and for the most part the developers are too busy supporting Windows to care.
Windows is going to continue to be the favored platform of game developers for the foreseeable future. It has the massive install base because developers target Windows and developers target Windows because it has the massive install base.
So that's why you see favoritism towards Windows in the game dev industry.
Inside the web dev/system admin industries you'll likely see a strong bias towards Linux and maybe MacOS (dev surveys show Linux being far more popular though).
I think all 3 OSs are pretty great and I use them on a regular basis. Its hard to objectively prove that one is better than another in general. Its easier to prove when yu pick a specific use case.