Doesn't look all that silent to me?
Seems to be much ado about nothing currently. Even in the release notes it clarified that this feature is not yet included and the quarantine list will be shared once ready (and will at first be mostly test domains). The blog seems to be wildly speculating on its intended use and possible impacts given the knowledge currently available
Why? This is like some authoritarian clause in a new law being introduced with a reassurance that it will only be used for national security purpose. I feel the author is correct until more explanation is given. Even then it does not look good to me.
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