I think one can make an argument about breaking these behemoths up. There is an argument that they are wielding too much power.
What's kind of amusing is that if you've read a bit about the history of corporate concentration, it was the Democrats who passed anti-trust laws that limited corporate power and broke up monopolies in the early part of the 1900s. There were many tests to apply whether a company had too much corporate power. But that idea started getting unpopular in the 70s and 80s as conservatives started arguing against too much government regulation. And it was Robert Bork who made the decisive argument that dominates our regulatory bodies today that the only thing that mattered was whether or not the consumer received lower prices. If the consumer received lower prices because of an increase in corporate concentration, that was a good thing.
Well, the big Internet giants do lower costs for the consumer. But it is this conservative ideological framework that helps those Internet giants amass that power. It's ironic because I do think they are generally biased against conservatives.