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Google tries to defend its Web Environment Integrity
(techreport.com)
This is a most excellent place for technology news and articles.
it says something about "spoofing identity" which raises a good question. If this does happen, how difficult would it be to just lie about your client environment with a spoofer of some sort?
That's exactly what it is trying to prevent. Basically you, as an user is not to be trusted, so the website and your own computer work together to prevent you from doing anything the site deems inappropriate, like spoofing things, blocking ads etc.
It would be difficult. Your operating system, the browser, and the website's code would have to be compliant to pass the WEI check
Let's say you use a non-compliant OS (linux), or a non-chromium browser, or use userscripts, in all three cases you are locked out of the website.