ZKPs (as well as C2PA and similar user attestation systems) are quite literally a DRM scheme for the web, fraught with all the usual control and accessibility issues while still being relatively easy to circumvent by a sufficiently motivated and funded actor. Given the huge number of shady companies that run "phone farms" for purposes ranging from social media spam to Spotify royalty farming, I doubt they would even put a dent on this kind of automated abuse. They would however be very effective at locking every Linux and GrapheneOS user out of the internet.