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> When I've used to Amazon Go store,

My receipt was in the app shortly after (I walked about two blocks and checked). I think it took longer for an email to show up, but can't recall exactly

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My experience had been that it can vary quite a bit. Most of the time it’s pretty quick, but occasionally it can be over an hour.

Maybe that is a person verifying because the software flagged something as uncertain.

Very possible.

More likely, there's a work queue and sometimes it gets a bit backed up or falls a little behind while autoscaling resources kick in. Having fully dedicated capacity for something that's handled asynchronously, fluctuates with time, and can tolerate many minutes of processing delay would be a waste of money.

It's Amazon, to me it seems more likely they are tuning their ML with human input than they somehow need an hour to spin up AWS for their shiny new baby.

Maybe they use spot instances for all the compute.

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