[dsukhin]

This is fascinating, I didn't realize there was a spec for this for the web.

But this begs the question: Apple Privacy Labels "caught on" because Apple has unilateral control to enforce them in the App Store. If ostensibly the same idea for the WWW did not catch on, is the problem (1) the lack of enforcement/economic incentive mechanisms on the decentralized web or (2) that consumers really didn't care/know enough to create/enforce such free market incentives?

[rusk]

I would say both, and a bit more besides. I would say that the big players are actively disincentivized from supporting something like this.