It's ridiculous that you think developers aren't doing other things apart from kernel level anti-cheat to secure their games. There has been an enormous amount of engineering around combatting cheaters.

Why doesn't Microsoft just build a more secure operating system than reaching for Microsoft Defender and other kernel level protection mechanisms. Well because they are but they're not good enough which is exactly the point.

Gamers who use their PC to play games, will install what they can to play such games its a simple as that. Not everyone has the same tolerance to risk.