[tyingq]

I know there is skepticism that the opt-out http header is useful. Mostly because the places deploying it wouldn't call the floc API anyway.

But, it is certainly useful to publicly see floc sentiment. As far as I know, Amazon hasn't said anything publicly about floc, but now we know they are aware and doing something about it.

I saw that GitHub and The Guardian also rolled out the header.

Waiting for a website tracking who all has opted out to pop up.

I think the header also has value as a "last resort" to catch any unintentional use of floc if your org doesn't want it.

[josefx]

As far as I understand the explicit call to FLOC will only be a requirement once it has gained traction. Right now Google is still using whatever they can to make it viable, so explicitly opting out is necessary for anyone who wants to be on the safe side.