In 1999, I made my first purchase on Amazon. The last in 2011. What @pluralistic describes here wasn't even on the list of reasons to leave back then.
This is a good explanation and example of his own term, #enshittification. If you're still buying on Amazon, this might interest you. https://www.theguardian.com/technology/2025/oct/05/way-past-its-prime-how-did-amazon-get-so-rubbish