Windows 7 is a 15 year old operating system. As for the all spyware malware paranoid mythology, you’re not important enough for them to care about anything you do on your PC. All the OSes “spy” on you if you count anonymous telemetry as spying. Just block the target servers in your router. The point is, it’s 2024 and you get two options: Take off the tinfoil hat and get with the times or keep the tinfoil hat on and be stuck with not being to use modern things.
Playing games on Linux distributions like Kubuntu via ProtonDB or Wine is no problem and there are even gamer centered distros like Lutris. If you use steam it's the same 'click on install' like in Windows', just because steamOS is Linux based. What does often not work under Linux are anti cheats (there is a site for that
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). And if somebody wants to or has to stay with Windows (For example you can't cross compile in Unreal under Linux or MacOS, meaning develop in Windows for Linux works, but not under Linux for Windows.) debloated options like Ghost Spectre, Atlas OS or ReviOS exist.