I don't really think of showing rich shopping results as preferring "Google's product". It's just showing links to merchants in a fancier UI. It's fundamentally still search, linking out to 3rd party websites.

FWIW, even what you think should be allowed is banned in Europe. On Google Search in the EU there is no "Shopping" or "Maps" tab.

Did they remove them due to the case they lost in 2017 then? Products is still available, but doesn't work like shopping does which is much more similar to pricerunner.

https://www.google.com/shopping is still available, just no link to it, so about as decoupled as a separate domain?