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> However, GNU seems to have not changed (enough) with the times. A new breed of open source software is steadily chipping away at GNU's monopoly (e.g. LLVM, musl etc).

I don't think "losing their monopoly on free software" is something that the FSF or GNU are all that worried about. Their main concern is ideological/social/political - that free software is created, exists, and that the licensing rules around it are followed. If every piece of software they ever wrote got superseded by another piece of free software that was better I think they would be overjoyed.