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Cloudflare and Fastly should step up and add this header for all domains by default. That would probably be enough to kill this idiotic mal-feature.

Client side there is also the DNT header which everyone, including Google is happily ignoring. So I'd imagine things will get ignored similarly here.

You are suggesting that Chrome will ignore this header sent from a site. You are suggesting that sites will not be able to opt-out.

Seems like the easierst way to opt-out of FLoC is to use a browser that does not support it. I already do that. It does not even support CSS or Javascript. I love it.

With client-side header "DNT", sites can ignore it. With server-side header "Permissions-Policy", browsers or other programs that make HTTP requests can ignore it.

Wrong syntax.

http-response add-header Permissions-Policy "interest-cohort=()"