I'm someone who hasn't used Windows for gaming in years, and has been enjoying Proton since 2019.
But, especially for children, a lot of these games are a big part of their social lives. Paragraphs could be expended on the vices of these games, but I disagree with considering them easily ignored.
As others have noted though, a surprising lot of these games with anticheat do work on Linux. It's not even rareOverwatch, Halo, and Helldivers to name a few.
Plenty of games without anticheat won't work either. It's far from the Windows situation of installing whatever you want and expecting it to work out of the box. And the "gold" rating on ProtonDB/WineHQ means nothing, you have to check the comments.
Sure Linux also works with a lot of games nowadays, and you can ignore whatever doesn't. I use a Mac and accept that it'll run even fewer games. Not my priority.
*unless the developers explicitly enabled linux userspace support which some do
https://areweanticheatyet.com/