I'm sure the process is fraught with errors, of course, but there does seem to be data to feed the model and data to serve as a test set. The easy thing about targeting ads with demographic data like this (unlike trying to make statistically-accurate statements about demographic data like this), is that if a person responds to some types of ads like a 45-year-old scuba instructor or whatever, it doesn't matter if they really are any of those things.
I'm sure the process is fraught with errors, of course, but there does seem to be data to feed the model and data to serve as a test set. The easy thing about targeting ads with demographic data like this (unlike trying to make statistically-accurate statements about demographic data like this), is that if a person responds to some types of ads like a 45-year-old scuba instructor or whatever, it doesn't matter if they really are any of those things.