https://techcrunch.com/2020/04/21/google-switches-its-shopping-search-service-to-mostly-free-listings/

Google is making a change to its product search offering, meaning that unpaid listings picked by algorithm will dominate results displayed on the Google Shopping tab instead of mostly paid product listings.

In a blog post announcing the move, Bill Ready, president of Google’s commerce division, cited the coronavirus pandemic as a catalyst for Google to speed up a pre-existing plan to switch from Shopping results being determined by paid ad auction to mostly free listings.