Been thinking about it a lot, and how would people be able to communicate with each other if the forces of capital (huge telecom conglomerates) just decided to shut down and become dormant? Capitalism has such a stranglehold on society that we'd be absolutely fucked. What about our electrical grids? And to add onto that, you're probably facing the US military in addition to the militaries of all its allies
Sure the centralization of the media is a problem, but revolutionary leftist ideas can still be shared successfully to a point before the bourgeoisie step in — look at how good r/CTH got at pipelining libs by the time the CIA stepped in.
It got shut down eventually, sure, but it means it's possible to use the internet to disseminate revolutionary ideas — there's been a lot of criticism of the consolidation of the internet into like 6 websites and movement towards a decentralized internet.
I'm confident that another left pipeline on the scale of CTH will exist in the future, especially as material conditions deteriorate further. Hopefully this time the left will have learned our lesson from the CTH ban.