Unless someone actually buys a facility (or facilities)with express purpose of making a monopoly, and does not rent it for cheap to others. Detecting the attac

Unless someone actually buys a facility (or facilities)with express purpose of making a monopoly, and does not rent it for cheap to others. Detecting the attack or vulnerability to it is easy in smooth difficulty increasing proof of work systems by looking for spikes in difficulty... But waiting for too long is not acceptable.