this is the most comprehensive collection of ZKP criticisms
https://www.eff.org/deeplinks/2026/08/zkps-arent-age-verification-silver-bullets
It seems to boil down to the fact that they will be tied to wallet apps that are likely (?) to be very poorly implemented and introduce massive security holes and a host of previously non-existent vulnerabilities. To be clear I am generally pro ZKP, but I take their point and I generally don't trust any government to implement them well and without a host of other bad ideas riding their coattails