I got the feeling it was a bit weirder than that, it was more like skynet (who wants to kill everybody because handwave) but now skynet wins the opening move.

Unrelated to that but somewhere in the 'dna gets rewritten by LLMs to do blockchain stuff' is a good science fiction horror story, where for people reality gets more and more rewritten into a NFT blockchain landgrab landscape. Suddenly you start seeing and dreaming about Endless voids of undeveloped basic land plots with sparce buildings filled with AI generated NFT art which they try to sell you, and endless land of colors and impressions where everything feels flat and fake and uninspired. Because people not only build the 'Make biology into blockchains' LLMs but also made the 'try to exploit this for financial gains' LLMs. Imagine a machine creating variants of Axie infinity stomping on other bland pokemon like blobs inside your mind forever, now with integrated dating apps!