First off, in some sense everything is political. Next, I am not claiming that you can't be supporter of open source while also holding a wide array of associated political views. My point is that the concept of open source fundamentally rejects the ideal capitalist conception of the world as a bunch of purely rational self-interested agents seeking to optimize wealth and economic output. Willingly performing labor for its own sake, for the benefit of others, with no expectation of return value, is obviously not capitalist behavior.

"First off, in some sense everything is political."

That's what every partisan hack says before they shove their culture war politics down your throat. Some people out in the real world get laid and just can't be bothered to hear your opinion about the race-swapped Snow White remake, regardless of whether you loved it or hated it.