Information you don't have is by definition not relevant to compare targeting strategies, which are based on information they do have. Either you have this inf

Information you don't have is by definition not relevant to compare targeting strategies, which are based on information they do have. Either you have this information, then Rebelgecko's comment explains why it would make sense to still have such ads. Or you don't have this information, then other information (such as "you searched for P") probably leads to this result as well. In both cases this strategy makes sense intuitively, and I'm pretty sure that ad-tech knows what it's doing to maximize returns, if only by looking at the metrics.