Back when [1] it was fashionable to advocate FOSS as ideology [2], we were thinking about tons of FOSS adversaries and how to protect from them - some real, some imaginary. The death of FOSS would come from big closed-source vendors, or from regulators (lobbied or just ignorant), from whatever.

We never envisioned that the actual FOSS death spiral would come from progress itself, much more so from AI...

[1] Oh what fun did we have. One of us in the Greek FOSS community actually put RMS in jail. [2] Something that I think nobody except RMS ever seriously believed in.