Google used it's search engine dominance to expand into analytics, advertising, e-mail, maps, mobile apps, browser, and probably more things I can't think of off the top of my head. Take maps for example. They drove (or bought) their competitors out of business to become the dominant player and then dramatically raised the cost of their API. That's classic abusive monopolistic behavior.

Or look at the browser. Adblockers have been the number 1 extension since browser extensions were a thing. It doesn't take a genius to see why they aren't built into Chrome/FF. It's another classic abuse of a monopoly. They used search to bully their way into being the dominant browser and they use that dominance to protect their ad business.

Google abuses its power, similar to what a monopoly can/does do, without strictly being a monopoly.

That's part of what the original article is discussing.