Incidentally Marx argument for why he believed a revolution would eventually become inevitable also depends entirely on competition: He argued that it is the ongoing effectivisation of capitalism through competition that will eventually trigger revolutions by making too many people unemployed and/or destitute.

This is why I question the idea that large social networks should be able to remove whatever they want. It would be nice if there were consumer protection laws to help balance the scales a bit. For example, some of YouTube's censorship and demonetization seem pretty aggressive.