One important point for everyone to keep in mind, whenever you read an article about some years-long competition investigation, is that it is talking about conduct that happened in the past. In this case, by internet standards, we're talking about conduct that happened a long, long time ago (but, in this galaxy).
When Google shopping was introduced it was a search product, actually, and was not "just an ad." It only became an ad in 2012: https://en.wikipedia.org/wiki/Google_Shopping#Change_to_paid...