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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.
No that should still work. The server will send a page to your browser, and when the browser renders it, it will request the ad. And your pihole will block the request.
Unless WEI somehow changes how page rendering works but I don't think so.
Not really. The environment could easily include resolution of an ad server. If a site uses two ad servers and neither resolves, the attestor could decide to fail the environment. The problem is the attestation is left open for the attestor to create. It could check web browser, extensions, operating system, etc. I fail to see how this is at all privacy protecting to begin with.
That's absolutely horrible.
Stop WEI.