Antitrust legal theory has grown by leaps and bounds from 20 years ago. Now there are so many theories related to what a monopoly is, even in the absence of a single dominant company, oppressive pricing, etc. When these legal theories migrate from academia to politics is anyone’s guess though (not commenting on if it’s fair also, just noting).
This was 100% going to happen to Microsoft with their Office and Windows division being split up, but then the judge in the case, who was very accomplished and smart, made the mistake of sitting down for several interviews with a journalist about the trial BEFORE THE CASE WAS OVER. Microsoft’s lawyers leaped on this, and were able to save the company.
One consequence though was Bill Gates accelerated departure from CEO into Chairman and the taking over of Steve Ballmer (ugh).