Fundamentalism implies a religion-like devotion to your principles, it's definitely pejorative used outside of this context. FLOSS is not a religion. From http

Fundamentalism implies a religion-like devotion to your principles, it's definitely pejorative used outside of this context. FLOSS is not a religion. From https://en.wiktionary.org/wiki/fundamentalism https://en.wiktionary.org/wiki/fundamentalism : > The tendency to reduce a religion to its most fundamental tenets, based on strict interpretation of core texts. Using such a strong word to define your adversary's position is a way to discredit them.