Grubhub charges restaurants for phone orders based on some claimed artificial intelligence determining that an order was placed on the phone call + the average price of the last 6 internet orders. A reporter easily found examples where reviewing calls where they decided to charge came up with false positives.

"I reviewed some of the recordings for Ghost Truck Kitchen and found multiple false positives, where Grubhub charged the restaurant between $7.80 and $7.92 per call for informational phone calls that did not result in an order."

https://www.vice.com/en_us/article/wjwebw/yelp-is-sneakily-r...