But you have to consider that AWS with all their enterprise customers is something entirely different than Alexa.

And yes, it’s literally written in their documentation.

https://aws.amazon.com/q/developer/faqs/#topic-1

“ For users who access Amazon Q Developer with the Pro Tier, your content is not used for service improvement, or to train any underlying foundation models (FMs). Unless explicitly opted out, content from Amazon Q Developer Free Tier might also be used to enhance and improve the quality of FMs. Your content will not be used if you use the opt-out mechanism described in the documentation. For more information, see Sharing your data with AWS.”