I believe it's because they were using their monopoly power to give that software away for free, while their competitors couldn't and ended up selling or going out of business.
The DOJ should really be looking at things like YouTube, which doesn't make any profit (I don't believe) but since Google proper supports it, no one can compete with it. That might be why Google is pushing so hard against ad blockers, they need to make YouTube profitable to avoid prosecution.
Google bought YouTube in 2006. Coincidence they care about YouTube ad revenue so much all of a sudden? I guess they were getting around to it eventually.
The DOJ should really be looking at things like YouTube, which doesn't make any profit (I don't believe) but since Google proper supports it, no one can compete with it. That might be why Google is pushing so hard against ad blockers, they need to make YouTube profitable to avoid prosecution.