They say they won’t use it to sell ads:

> “To help you easily view and keep track of your purchases, bookings and subscriptions in one place, we’ve created a private destination that can only be seen by you,” a Google spokesperson told CNBC. “You can delete this information at any time. We don’t use any information from your Gmail messages to serve you ads, and that includes the email receipts and confirmations shown on the Purchase page.”

What guarantee is there that this is not being used for other purposes? To train other kinds of models? To, say, monitor other people’s AWS bills, in order to optimize their own offerings? How likely is it that such a project was approved with no gain except adding perceived value to the Gmail product? I have a hard time believing they would do it only for that.