Red Hat gets money to develop Linux via RHEL support contracts with other companies. As far as I'm aware, very little government money is directly funding development of software in the US, and that's already missing the forest for the trees, since we're talking about the capitalist United States. It's a stretch to say that computers or open source software or whatever were actually developed in spite of capitalism. There's stuff like Germany's Sovereign Tech Fund that goes towards various open source things, but that funding is also from a capitalist government.

There is definitely a lot of computer science research that happens at universities, which private companies profit from greatly (same as with every other industry), and that's the whole point of that relationship. But again, it's still the US we're talking about. This is how the US works. You can't say, "computers were developed in a capitalist country, with approval of the capitalist ruling class, for the benefit of capitalists, but they're actually not good because of capitalism".