In Capitalism in the Web of Life, Jason D. Moore posits that the tendency of the rate of profit to fall is really a manifestation of the tendency of the ecological surplus to decline. He lays out how the organization of society-and-nature (they are the same thing btw) creates limits to available ecological surplus, and new technological and social innovations enable weakening modes of organization to break into new frontiers of ecological capitalization. Each of these successive reorganizations (think: mercantilism, settler-colonialsm, fossil industrialism, monopoly imperialism, financialization, etc) more and more quickly burn through the ecological surplus available to them. This is the cause of cyclical capitalist crises, as cheap food, fuel, labor, and nature are chewed up in hungrier and hungrier systems with shorter lifespans than their predecessors. Pure digital financialization is the current desperate effort to wring profit out of a situation where natural surplus is at an all time low and human demand is at an all time high.