It is hardly anti-capitalist. It is anti-exploitation. Granted, given the some of capitalists we currently have to put up with, it is easy to miss the distinction, but it is there.
I would, however, encourage you to continue to avoid software that does not meet your ethical standards. That is what I do, and why I refuse to use software from a number of sources myself.
It's literally anti-capitalist: It is specifically designed to prevent software from being a form of capital that rent can be extracted from, since Free software can be given away by anyone who has it, destroying the software's value as capital. (The Free software model, only knowledge and skill in consulting and services is useful as capital)
I would, however, encourage you to continue to avoid software that does not meet your ethical standards. That is what I do, and why I refuse to use software from a number of sources myself.