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Yes, it will become useless. The header that is..

• WorldMaker 6y ago
  Google already has shown bad faith in opt-out headers like this when they immediately started ignoring Do-Not-Track as soon as non-Chrome browsers made it a default. The fact that the spec for this awful project uses an opt-out instead of an opt-in header seems a pretty clear signal to me that Google may not have any intention of following it in the long run.