I think this is a slightly different case no? If the ad network is using a very high precision variable to soft-link anonymized accounts, then randomizing the values between apps should break that.

Your analogy applies more to things like trying to anonymize your traffic with Tor, where using such an anonymizer flags your IP as doing something weird vs other users. I’m not convinced simply fuzzing the values would be detectable, assuming you pick values that other real users could pick.