For people saying this to calculate the final price with shipping and tax, it's not (or at least not entirely). It is for this new sales conversion dark pattern where prices aren't listed until you add to cart. Ebay sellers are particularly bad offenders: https://www.ebay.com/itm/Open-Box-Certified-Samsung-Galaxy-1...
Google disagrees with you: > When The Wall Street Journal contacted Google in June, a spokesman at the internet giant, after a few days of digging, provided an update: The mystery shopper is a bot of its own creation. The purpose: making sure the all-in price for the product, including tax and shipping, matches the listing on its Google Shopping platform or in advertisements.
it's rather annoying because it creates dozens of "abandoned" carts per day which we have to continually clear out (based on Google's known ip address ranges) so our reps can go through actual abandoned carts.