You can’t in good faith try to convince anyone that cancelling Prime is as easy as canceling a subscription on iOS. After cancelling prime whenever you order something dark patterns are used to try to get you to sign up. One such patten is that orders default to charging for shipping with a message stating that if you sign up for Prime shipping is free. This is even if your order qualifies for free shipping. Another is that when you checkout you get taken to a page that offers you Prime at a reduced rate for a week or two. You have to decline before checking out.
You are not engaged in a good faith discussion. Peddle this nonsense to someone else.