Z:gnu-www-ja-is-ever-good-use-nonfree-program--a3b4bc-In 1983 I decided to develop t/en

In 1983 I decided to develop the GNU operating system, as a free replacement for Unix. The feasible way to do it was to write and test the components one by one on Unix. But was it legitimate to use Unix for this? And was it legitimate to ask others to use Unix for this, given that Unix was proprietary software? Of course, if it had not been proprietary, it would not have required replacing.