My favorite example of this sort of thing, mentioned in the Guardian story, is the kerfuffle late last year when Expensify's receipt-reading SmartScan feature was found out to be partly backed by human receipt readers:
https://qz.com/1141695/startup-expensifys-smart-scanning-tec...
(I don't file expenses often, but personally when I do so through Expensify, I find SmartScan so slow that I now assume all my "SmartScanned" receipts are going to a human.)