If the deal is I give the seller money and get the product, that's fine. But if next month the seller says actually now even though you're paying me I'm going to show you ads anyways, or yeah you gave me money but I've decided to take back the product without refunding you[0]... it is easy to become sympathetic to pirates.
[0] https://arstechnica.com/gadgets/2023/12/playstation-is-erasi...