Just because software is free doesn’t mean it’s free software.
This may confuse those who only know the Windows world, where the software animal known as “freeware” is readily available but truly free software is a bit more scarce. They may be excused for thinking, when we Linux users talk about “free software,” that they use free software too. After all, doesn’t a free antivirus program qualify as free software? Or what about that gee-whiz free password manager that’ll generate and store five or six passwords–more if the “pro” version is purchased?
Linux users will also be excused for rolling their eyes before answering, “Nope. Neither of those examples is what we mean by ‘free software.'”