If every person was the same on the average, then we would not have targeted advertising. Google/Facebook et al would not have invested millions (or billions?)

If every person was the same on the average, then we would not have targeted advertising. Google/Facebook et al would not have invested millions (or billions?) of dollars in building a targeted ad network. The evidence is against you in terms of where people (both the seller and buyer) place their money. Knowing what a type of person wants on the average is not discrimination.