The thing about trading bots and purchasing systems is that they're generally self-contained and regulated by a very human legal and physical world system that determines which algorithms are allowed to run on the platform, which contracts and title deeds are void and which commodities don't actually get physically delivered. Even Stross' old-school cyberpunk singularity story throws in a plot point where a decision is made by an imam! If private equity firms want to force businesses to act in a certain way they're much better off sending legal threats to management than coding a certain set of rules into a purchasing system which is readily bypassed with a quick phone call to the bank, unless those firms think the algorithm is doing a terrific job with the purchases in which case maybe it's not so malevolent after all - computers making real time purchases in line with the parameters management think benefit the firm are useful. Even toy systems like the DAO with no purpose except to prove that "corporation as code" could be a real thing saw the ecosystem rapidly monkey patched when people started to dislike the code's outcomes. They're also a reminder that people have very strong incentives not to work towards universal "corporation as code"