A May 2023 report from The Information revealed the myriad tech problems Amazon was still having with the idea six years after the initial announcement. The report said that "Amazon had more than 1,000 people in India working on Just Walk Out as of mid-2022 whose jobs included manually reviewing transactions and labeling images from videos to train Just Walk Out’s machine learning model."
https://arstechnica.com/gadgets/2024/04/amazon-ends-ai-powered-store-checkout-which-needed-1000-video-reviewers/