I don't buy this 'against bigness' argument at all, similar to the 'surveillance capitalism' critiques of Zuboff that are so popular. The central thesis is just plain wrong. Large tech firms aren't (most of the time) rent-seekers. They're competitive and innovative, and centralization is not prohibiting innovation, it's enabling it because in our information-based systems the limit to how large an effective institution can be has gone up. Aggregation of data improves efficiency. We have enabled a much larger degree of planning.
Arguing for trust-busting to solve our problems to me sounds like arguing for a return to artisanal-craftsmanship when faced with the negative effects of modern capitalism. The issues may be identified correctly, the solution is anachronistic and going into the wrong direction.
Instead of attempting to returning to some anarchy of an idealized free-market and opposing large corporations and government, which effectively just means you're going to be sidelined and irrelevant, the goal needs to be to figure out how these big tech mega-structures can be aligned with the interests of the public.
Google isn't a robber baron, the analogies just fail. The only thing they're robbing are other industry oligarchs while users get everything for free.