In various sectors, you need to be able to explain why you/your-system did what it did. Exchange Act Rule 15c3-5 is probably the most relevant in financial circles:

https://www.ecfr.gov/current/title-17/chapter-II/part-240/su...

Note: I am neither a lawyer nor in financial circles, but I do have an interest in the effects of market design and regulation as we get into a more deeply automated space.