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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.
Usually when a company loudly proclaims that "we have this quality" they're compensating for not in fact having it.
You get the same in people: "I'm so smart", "I'm so beautiful", "I'm so confident" and so on are usually said to others by people who don't actually believe they have such (otherwise self-evident) qualities.
In that logic "Do no Evil" was a red flag.