One potential target audience might be employees / executives of publicly traded companies. If Alice owns stock in her employer or her employers' partners / suppliers / clients, she may be very interested in an algorithmic position manager to help her achieve her financial goals (e.g. selling down if the position exceeds a certain percentage of her net worth).
The main reason Alice would like this is to create an audit trail that defends her against any hypothetical insider trading accusations. That is, your brokerage will have records that explain not only what trades occurred (as any brokerage will do), but also why those trades occurred (you ran algorithm F on X input and F(X) is what popped out).