I always use the competition to the extent that it's available. My main point is that sometimes, there simply are no good non-Windows substitutes.
Secondly, I'm pointing out that a lot of people have spent money on licenses for Windows software that has a Mac/*nix equivalent. (I haven't personally, but this applies to a lot of people.) If you have hundreds or thousands of dollars invested in those licenses, switching away might not be financially viable.
If either of these situations applies to you, I sympathize with your complaints about Windows and its licensing system.
His point is that there are no good non-Windows substitutes precisely because the non-Windows market for that software is too small and that by using the Windows version you are removing yourself from the already-too-small market that you should have been part of, which continues the cycle. Your points are definitely valid, but they only reinforce the argument that pirating Windows only harms the competition. Put another way, if you were completely unwilling to either pay for or pirate Windows, the market for the hypothetical non-Windows substitute for a program you need would is guaranteed to be one person larger than it currently is, whereas with the willingness to pirate Windows, that market may be one person smaller.
Secondly, I'm pointing out that a lot of people have spent money on licenses for Windows software that has a Mac/*nix equivalent. (I haven't personally, but this applies to a lot of people.) If you have hundreds or thousands of dollars invested in those licenses, switching away might not be financially viable.
If either of these situations applies to you, I sympathize with your complaints about Windows and its licensing system.