I don't believe it's rejecting the monopoly concept, but rather pointing out that monopolies are but one (economic) instance of a broader pattern, monocultures. Monocultures are hyper-enriched in some aspects but depleted in many others and most importantly depleted in diversity. From game theory we can understand monocultures as an extrema on the exploration-exploitation tradeoff (trading off all exploration for exploitation). From evolution we know how this ends (poorly).