That's ok if you look at it that way. But at the end of the day, it's just a tool like any other. Personally I find it really silly to put any moral questions into it because I don't believe it's worth my time to think about it, lose time on silly things and/or sacrifice the quality of my work. I'm not trying to imply anything about Linux, btw, it's the same for the other ways around. It just feels stupid because it ends up like a political discussion, when it really shouldn't be. You have the option to use basically anything and choosing to limit yourself over that is just plain stupid imo. You could make the arguments for how they process data, which is a whole other discussion, but then again, there are plenty of workarounds to all of those problems (which is exactly what some people are doing with virtualization, different machines entirely, OS tweaks, etc., which is fine, because they're benefiting from it). Nothing against FOSS or otherwise, btw, I do agree about the need to support, but there are so many other ways to do it. Just using it isn't enough, sadly. As the point of this OP is - it's also market adoption, marketing itself, etc. None of this changes the fact that using certain tool(s) (e.g. gdb) is best done on a certain OS (e.g. a Linux distro) at a given time.