Amazon has a bad history in dealing with ToS for Prime in general. In the beginning Prime was about free 2-day shipping and $3.99 next-day shipping, and was wr

Amazon has a bad history in dealing with ToS for Prime in general. In the beginning Prime was about free 2-day shipping and $3.99 next-day shipping, and was written into the ToS. Then one time I wanted to ship something next-day and the charge was going to be $8.99. I was curious about when it had changed, and what the rules were: but the current ToS didn't specify a particular price, and I couldn't find any notification from Amazon about the change, so I went digging in Wayback. To cut things short, at some point Amazon changed the ToS, removing the requirement that they notify customers of future changes, while the $3.99 price remained the same. Then, at some point in the future, Amazon removed the $3.99 guarantee but was no longer required to notify customers that they'd now be paying more for that service. Very sneaky.