Back in 2018, Amazon opened its first cashier-less grocery store. The technology -- which it later branded as "Just Walk Out" -- was intended to allow customers to do exactly that. All you had to do was put items into your cart and walk out of the store. And then, through the magic of sophisticated computer vision, machine learning, and lots of sensors, you would be billed and sent a receipt.

However, this month the company announced that it will be moving away from this technology, and instead focusing on its Dash Carts (more on this shortly). It turns out that the technology wasn't nearly automated enough.

Last year, The Information reported that "Just Walk Out" was relying on at least 1,000 off-site workers in India to constantly review video footage and figure out who had bought what. This is why it apparently took so long to receive a bill sometimes; humans far away were working to figure out if that was a persimmon in your hand, or a tomato.