> A program is free software if it gives users adequately all of these freedoms. Otherwise, it is nonfree. While we can distinguish various nonfree distribution schemes in terms of how far they fall short of being free, we consider them all equally unethical.

For people who think that users deserve the freedom to run, copy, distribute, study, change and improve the software they use, nonfree software is indeed unethical. Even more so when the software is used by the developers as an instrument of injust power.

Implying that non-free software is unethical isn't rude. Especially since I didn't insist that this particular software is deeply unethical. I just suggested that support for ethical software like GIMP is the right thing to do and so supporting less ethical software is something I'm suggesting avoiding.

Now, having learned from other comments about this particular case, I'll agree that as proprietary software goes, Paint.net sounds unusually good in the ethics realm, just not quite on par with GIMP, but I'd say net ethical after all.

Absolutely. It is.

There may be few other options in the current global economic system, but it does not make it any more ethical.