I think government should not be breaking up big successful companies only because they control >50% market share. What Microsoft did with IE was nasty but Google acquiring DoubleClick, AdMob, YouTube etc. is not nasty at all. If Google for example made the same exact product like YouTube and then leveraged its massive resources and distribution channel to destroy YouTube and claim the market share that would be problematic but otherwise I don't see a problem.
Punishing the best student in class only because he or she is the best is not cool at all.
Allowing that was probably a mistake. IDK if it's possible to undo, but letting the two biggest advertisers merge was is like almost definitionally anticompetitive.
Why they didn't block the merger when it happened? they could've but now it is too late. The same thing would be splitting up Facebook and Instagram when they all already so interconnected.
Punishing the best student in class only because he or she is the best is not cool at all.