I'm using a ML-based captcha solver that is free software available on Github. So far it has solved 100% of the Amazon captchas it has encountered.

The reason Amazon have a reputation of being good at blocking IPs is that their responses are (purposefully?) obscure. The way it works, it filters out script kiddies and lets engineers through, which probably are a small minority of the people scraping Amazon.

I also haven't looked into this space outside of a quick DDG search after reading your comment. It looks like the big hole is that Amazon rolled their own captcha a while ago and haven't kept up with what automation can do now.