From gbhackers.com
Google tracks every single purchase that you have made online in years if you have the receipts sent to your personal Gmail account.
The purchase records can be accessed through a page called Purchases, which shows a list of products that you have purchased using online services such as Amazon, Flipkart, Swiggy, and more.
Years before Google said they would stop collecting data through Gmail for ad targeting purchases, but according to the CNBC report, Google is still collecting much personal information behind the scenes.