Soviet Union looked a monolith that will stay forever. So did 3dfx. The impregnable titans challenging the time itself.
Putting 3dfx between Soviet Union and Microsoft is some sort of misunderstanding. That company last only few years and never had bilions of dolars. 3D market was to young to predict and only Voodoo 1 was beyond comparision. Voodoo 2 didn't stay ahead of Riva 128 in performance (if I remember correctly).
And Soviet Union was ruled by the leaders which didn't care about people. I think Micorsoft cares about its customers (sometimes better sometimes worser but still) and now number of those customers is much much larger than entire Soviet Union population ever was.