oh, seeing how doctorow and schneier both quoted stross about this recently, I assumed he'd come up with it before me, but... it looks like I may have, erhm, priority? 🙂
https://www.fsfla.org/~lxoliva/#singular>

five minutes into the 2016 LibrePlanet speech, I stated that I had realized the year before that the notion of corporations had already materialized the singularity that we so often feared. indeed, that was the realization around which I built that entire speech 😉

in 2019 I came across another writer who had also figured that out, publishing it at just about the same time as stross
https://patternsofmeaning.com/2017/11/30/ai-has-already-taken-over-its-called-the-corporation/

it was an idea whose time had come. that's so cool!

CC: @pluralistic@mamot.fr @cstross@wandering.shop