It wouldn't surprise me if no one at Costco realized there was an issue. My guess is Meta (facebook) gives them a widget -- code they don't have to write -- that ties into Costco's website. In exchange, Meta gets to see what poeple are looking at and buying. That's icky but understandable for stuff like snow tires and bacon, but gets super serious when folks buy, say, antipsychotics or abortion pills. Only your doctor and pharmacist should know you're getting those meds.