Google is already pushing Web Environment Integrity into Chromium

google want websites to be able to check whether you're running an approved browser. And they also want to be the ones to have the authority to decide what an "approved browser" is.

Given that google is an advertising company that owns a browser, constantly tries to cripple ad blockers they will probably simply start saying that any browser that doesn't implement the stuff they want (crippled ad blockers) is "untrustworthy"