If they do, then it’s uncompetitive and it deserves to be broken up. We may not be in a mobile OS duopoly if Google wasn’t allowed to dump infinite amounts of money into a loss leading product.
In that case every device should allow users to trivially change their OS, or hardware manufacturers who make operating systems could be accused of the same thing. Many companies make products that don't make money but help promote and sell their products that do. My point is that os/app store metrics are too narrow rather than approval, because I am far from in love with the business model of any of the companies targeted by this report. Although I think the right move would be more consumer-friendly regulation rather than break ups.
Google dumps money into Firefox too. They can argue there is no special treatment for Android, and they could justify it after a breakup by the Android company serving “major ads” for Google.
