anecdotally ( i turned off ads for my users and switched to contextual-only since GDPR) non-targeted ads bring ~40% less revenue. I suppose it varies widely bet

anecdotally ( i turned off ads for my users and switched to contextual-only since GDPR) non-targeted ads bring ~40% less revenue. I suppose it varies widely between publisher type , country etc. I do not believe their data is representative, and i also think it is the wrong kind of data. My hypothesis is that advertisers overpay for targeted ads, but this is not the right way tot test that. They would need to find data or experiment that correlates advertising spend to revenue generated.