I don't think the DoJ realise how much google is integrated with web-browsing now, I work for a company that uses the Google ecosystem, where chromebooks are encouraged, everyone has a google email address, all of our services and subscriptions are accessed through SSO for our google accounts, the browser can be managed through Google Admin, and even our windows laptops now use GCPW (google credential provider for windows) to log in any sync with their google drive, all of this uses chrome as the glue in the middle to make everything seamless and work easily.
I don't think the politicians making these decisions remember what internet browsing was like before google stepped in; remember askjeeves? altavista? yahoo search? They were all terrible along with the dozens of other ones that were either incompetent or malicious, and this is just talking about search engines and ignoring the browser problem back then, like people stuck on AOL's terrible browser, internet explorer being temperamental and capricious, etc.
For years I've been using chrome and have firefox installed as a backup in case something goes wrong with chrome (which has been very rare). I don't look forward to going back to the wild west days of hunting around for things to use and saying "wow I hope THIS search engine/browser isn't complete ****!" and before people say to switch to the next most popular: who's to say this won't happen again with THAT browser when it gets popular enough?
While I'm ranting, honestly "anti-monopoly laws" have been a joke for a while now, not because I think monopolies should exist, but because certain companies seem to somehow completely sidestep them (Microsoft, Disney, Apple, not to mention pharmaceutical corporations) despite being far worse than a lot of the companies that do get targeted, and from the outside looking in it just seems like they are buying off politicians to ignore them.