Most of this scraping (like Google indexing your emails) is legal if the user is informed (an in EU if they can disable it)

The team problem the article hints at iis doordash and Amazon claims the customer relationships and hides the customer from the real company that actually made the sale. They make themselves a middleman to displace others as much as possible and use their size to manipulate the market in their favor (like demanding higher margins than other retailers)