This is an interesting approach. I like the idea of describing a strategy in natural language instead of wiring everything together manually. How do you handle ambiguity when a prompt could be interpreted in multiple ways?
I do agree though, after 3 generally basic natural language prompts, I wouldn't trust it enough to handle my finances.
That being said, there are also legal implications that I'm sure this project would have to deal with before gaining any type of userbase.