I think that to a great degree it’s a question of tactics. DOJ must be very smart about how they do this. The department of justice has a budget of less than 400 million dollars yearly. Google has 17 billion dollars in cash. Google can bury the DOJ in legal work for the foreseeable future, I think. 🙂
Big companies are so large now, that they have more power than most countries. In addition to that, they are multinational and can move assets anywhere to stay out of reach from governments. In the time it takes to settle a government lawsuit, the world changes so much that the results of the lawsuits probably will be mostly irrelevant.
I’m hoping more for the EU to get somewhere with these four or five companies. Europe is less focused on capitalism, and more on humans, than the US. In America, corporations have always been valued higher than people. The tax percentages employees pay often are much higher than that of companies, and yet not everyone in America has social security and a salary they can live on.
#2: I think EU is less scared of making laws that even out the playing field between corporations and individuals. For instance by taxing companies over a certain size by turnover rather than profits, since profits can be shipped somewhere else where taxes are lower or nonexistent. Margrethe Vestager has shown before that she isn't afraid of powerful companies. 🙂