The well-placed gift shop is user interface design. The lying car salesman is just dishonesty. I think they are different. Taking it back to the subject medium

The well-placed gift shop is user interface design. The lying car salesman is just dishonesty. I think they are different. Taking it back to the subject medium: well placed ads or upsells are like the gift shop. They represent opportunities to make sales at the right time. Nothing wrong with that. But, deliberately opting people into a product by subtly checking a box or otherwise in a manner that you are hoping they don't notice or understand is just dishonest. It aims to deceive people, not sell a product. So, the proper anology is that the gift shop automatically debits your bank account as you walk through, while a worker slips an item in your bag. If you make it out of the airport without noticing, you're stuck with the bill.