This is a very weird, even quite childish, criticism.
There's an outside chance that some of the stuff Doctorow wants can be implemented. There's literally zero chance that companies in general are abolished (in favor of what, exactly?) just because a few megacorps, given perverse incentives, have become bad actors.
Besides, large firms are, effectively, the most unkillable human-derived things that exist. If you "abolish" them in one place, they'll nevertheless still exist in another, or they'll simply pick up move somewhere else, like high-net-worth individuals. "Headquarters" are often merely a formality.