It is notable that communism was not invented in Russia or China; it succeeded there, but only due to the incompetence of the people fighting them. If China didn't suffer the Japanese invasions in WW2, the Chinese Nationalists would've wiped out the Red Chinese, and without WW1, it's highly improbable for the Communists to have taken over Russia. Shit, didn't the Germans ship Lenin to Russia to take them out of WW1?
Communism still had a threatening presence in industrialized capitalist countries, despite them never fully taking over. Plenty of American leftists became Commies during the Cold War. Germany almost fell into Communism following WW1; it took the Freikorps putting bullets in people to stop that. Paris and London both had their share of left-leaning people who take pages from the socialist/communist handbook.
Shit, Breadtube itself is proof of that; people who typically come from middle-class or bourgeoisie families from capitalist countries, unironically voicing support for leftism or sometimes even socialism or communism. They might not have taken over, but they still have a healthy presence in the capitalist west. Most of these Breadtubers come from the middle class of openly capitalist countries.