There are clear anti-trust mechanisms to prevent market capture and the emergence of asymmetric power. Go back and see how much nashing of teeth Lina Khan triggered in SV when she started to enforce antitrust law and then compare it to what the Pinkerton agency was doing in the transition from the guilded age to the progressive era.
There is a vocal segment of SV that wants the return of the guilded age. Marc Andreessen as said that explicitly. Those of us in SV that value free markets and recognize that the progressive era actually saved markets from their natural tendency to self destruct when winners capture markets and destroy competition that provides the incentive to innovate and drives the price setting function for efficiency.