Because the generally accepted definition of capitalism isn't "a system in which private individuals own capital goods".
(Software and machines are means of labor [0]. They are not workers and they don't receive wages.)
That's a widely held misconception. We had economic systems with "private individuals owning capital goods" before and we didn't call them capitalism. [1]
One central characteristic of capitalism is wage labor. If you don't make profit from leveraging disparages between wages paid and profits made, you're playing capitalism, but some other kind of game.
[0] https://en.wikipedia.org/wiki/Means_of_labor
[1] https://en.wikipedia.org/wiki/Capitalism
