Surely it couldn't stay a secret in the industry. Especially as plenty of people spoke up against other questionable practices.
Maybe it's like the dieselgate thing where various engineers may not see the big picture, but I honestly do not believe this is the case. I have a strong feeling that for vast majority of people, ads have a significant effect on your purchases, perhaps you were not thinking about traveling to Aruba but after couple of your friends went there, talked to you about and you got bunch of ads showing beautiful Aruba you decided to go. They don't need to listen to you to "get you".
Maybe it's like the dieselgate thing where various engineers may not see the big picture, but I honestly do not believe this is the case. I have a strong feeling that for vast majority of people, ads have a significant effect on your purchases, perhaps you were not thinking about traveling to Aruba but after couple of your friends went there, talked to you about and you got bunch of ads showing beautiful Aruba you decided to go. They don't need to listen to you to "get you".