Nearly every time I've used Amazon, they've surprised me with something crappy and I'm left wondering how they're so popular. Recently, they displayed a "guaranteed delivery by this day if you order within the next 45 seconds" on the checkout confirmation. I had been paying attention to the cutoff time and the time had just previously said 40 minutes. All the digging I did supported the conclusion that both times were a fictional dark pattern to drive order completion.
Never mind the clingy stalker follow up spam when you price check an item outside of incognito mode.