Z:gnu-www-ja-is-ever-good-use-nonfree-program--0c73fb-The job of replacing Unix was/en

The job of replacing Unix was completed when the last essential component was replaced by Linux, the kernel started by Linus Torvalds in 1991. We still add to the GNU/Linux system, but that doesn't require using Unix, so it isn't a reason for using Unix&mdash;not any more. Thus, whenever you're using a nonfree program for this sort of reason, you should reconsider from time to time whether the need still exists.