It's absolutely, 100% intentionally misleading. They even recognize that internally and are currently being sued for just that.

In a complaint filed in the U.S. District Court for the Western District of Washington, the agency accused Amazon of using deceptive designs, known as “dark patterns,” to deceive consumers into enrolling in Prime, which provides subscribers with perks such as faster shipping for an fee of $139 annually, or $14.99 a month.

The FTC said Amazon made it difficult for customers to purchase an item without also subscribing to Prime. In some cases, consumers were presented with a button to complete their transactions — which didn’t clearly state it would also enroll them in Prime.

Getting out of a subscription was often too complicated, and Amazon leadership slowed or rejected changes that would have made canceling easier, the complaint said.

Internally, Amazon called the process “Iliad,” a reference to the ancient Greek poem about lengthy siege of Troy during the Trojan war.

https://toronto.citynews.ca/2023/06/21/amazon-prime-without-consent/