The only time I clicked on an ad, it was an ad about a product in Amazon I previously intended to purchase but it didn't have stock. My reaction was a "wow, do

The only time I clicked on an ad, it was an ad about a product in Amazon I previously intended to purchase but it didn't have stock. My reaction was a "wow, does it have stock now??? let me hurry!!! what? no stock? why do you advertise a product without stock???" After that moment, the ad kept following me during several days...