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PlayStation fans brutally reject Sony's disc decision, eye Windows 11 PCs over Xbox
(www.windowslatest.com)
This is a most excellent place for technology news and articles.
I can't see how they'd do it, proton gets installed by the steam client. That client doesn't run with root privilege, so at the very least they'd have to trigger a password dialog which would be highly obvious.
The average Windows user will happily click "yes" on the UAC prompt when it pops up, so I don't think it would be that conspicuous to someone who isn't technical. I'm also pretty sure PolicyKit could get involved but I've never messed with it.