Here's the thing: You function in your environment, and you need your environment to function. And currently, some element of capitalism is required to build large-scale undertakings - if for no other reason than that the people you work with have families who'd like to eat, be housed, etc.

You can fundamentally disagree with the system, but that means you opt out of all parts of it. And so they might not have been wrong about their belief system being incompatible with business/capitalism, but the idea that they could build something large without compromising was wrong.

I, too, would like Fully Automated Luxury Space Communism - but you cannot get there from here by willing it to be true. (And it chafes me to say that, but that doesn't change the truth of it)