This makes me think of the part of the GDPR that deals with automated decision making: https://ico.org.uk/for-organisations/guide-to-data-protectio...

"The UK GDPR gives people the right not to be subject to solely automated decisions, including profiling, which have a legal or similarly significant effect on them." I guess that would probably be buried in an employment contract at Amazon, but it might form the basis for a court case if it wasn't actually spelt out.

Just because a human has designed the algorithm doesn't make it non-automated: "A process might still be considered solely automated if a human inputs the data to be processed, and then the decision-making is carried out by an automated system. A process won’t be considered solely automated if someone weighs up and interprets the result of an automated decision before applying it to the individual."