I mean, building a panopticon to show me things I've already looked at may be effective but it seems like it's not the most worthwhile use of hundreds of PhDs for several decades? I also appreciate how Google continues to pay to show me Pixel 3A adds days after I purchased it.
Perhaps the advertisements you see after a purchase are intentionally delivered. Maybe testing has found a consumer is more likely to value and keep (vs return) a purchase, or recommend it to their friends, when related ads continue to be served for $time.
