They didn’t sprout from nothing. Even from the beginning, they were being interfered with by capitalist and anti-revolutionary forces who started out with all the money and resources, like the white army or the black hundreds, not to mention being neighbors with reactionary imperialist countries, like Germany, and coming from authoritarian countries, like Tsarist Russia, where those ruling elements (old regime nobles, business interests, rich landowners, generals, etc) still existed and were in power or at least a place to sabotage the effort.