While actually doing the signup is a pain, I just use a “hide-my-email” address and cut it off after I receive the item. And I’d personally prefer to enter my credit card info every time. I once accidentally clicked on the “Yes, sign me up for Amazon Prime today, even though I’ve turned it down literally hundreds of times,” button and they immediately charged my credit card without even an “Are you sure?” Alert. Luckily I was able to cancel and get it refunded relatively easily (after 5 screens of “are you sure?” And “do you want to just pause it for a few months?”).