"This internal contradiction is further demonstrated by the fact that the proposed solution to prevent misuse by websites - holdbacks - is to simply sabotage the functionality of the system itself, by making attestation probabilistic. This is not a workable solution to the problem: if the holdback rate of requests is low enough, the denial of service to legitimate users will simply be a cost of business that websites will accept; if instead it is high enough, websites will not use this system as it does not provide meaningful enough information, even for analytics purposes, due to the high uncertainty. There is no goldilocks zone where this system is useful but not open to abuse by implementer websites. You're either implementing a feature that can - and most likely will - be used by websites to exclude unattested clients, or you're implementing a useless feature."
https://github.com/RupertBenWiser/Web-Environment-Integrity/...