If the users don't control the program, the program controls the users. With proprietary software, there is always some entity, the "owner" of the pr… - Richard Stallman

You and I we exist for ourselves, fundamentally. We should care about others but each human being is a source of value, each human being deserves things. And so if you lose control over your computing, that's bad for you, directly bad for you. So my first reaction is to say: Oh, what a shame; I hope you recover the control over your computing and the way you do that is to stop using the non-free software.

The programmers who write improvements to GCC (or Emacs, or Bash, or Linux, or any GPL-covered program) are often employed by companies or universities. When the programmer wants to return his improvements to the community, and see his code in the next release, the boss may say, "Hold on there — your code belongs to us! We don't want to share it; we have decided to turn your improved version into a proprietary software product." Here the GNU GPL comes to the rescue. The programmer shows the boss that this proprietary software product would be copyright infringement, and the boss realizes that he has only two choices: release the new code as free software, or not at all. Almost always he lets the programmer do as he intended all along, and the code goes into the next release.

I didn't single out Microsoft. In fact, Microsoft had nothing to do with it in the beginning. Microsoft in 1983 made a toy operating system for toy computers, and I hardly paid any attention to it.