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Doesn't contradict with my statement, but yes. Luckily the rest 97% of developers are covered.

Are you sure that 97% developers use Windows? From my experience developers use Linux / OS X more often than regular users.

Only if you mean web applications. Many do write desktop applications.

Not only web applications. There's all the iOS devs, for instance. Pretty big market, and it's rather hard to do this job on a Windows machine.

Those are not on GNU/Linux systems.

As for the market size it is a matter of perspective. On my home country iOS comes out on third place.