Yes, open source software often requires funding and corporate support because we live in a primarily capitalist society. That doesn’t make it capitalist itself.

And I think the freedom foss offers is socialist - it necessitates cooperation, it’s open for all to see and contribute to, and the idea of ownership is very loose. It doesn’t matter what the political motivation is.

The idea of free software is extremely socialist/communist. People working together to create something that anyone can use for free, with profit being a non-existent or at least minor motivator.