(Customer has $50+bn in revenue) tells us nothing. How good is it going to be for YOU? Because that should be the main data point for this decision. You might w

(Customer has $50+bn in revenue) tells us nothing. How good is it going to be for YOU? Because that should be the main data point for this decision. You might want to charge them 10X-50X the usual price if their request involves trade secret disclosure. Insofar as their motives are concerned, you should assume the worst; that that they will steal your IP and force you into endless litigation. From a game theoretic min/max perspective this is a sound way to think about it. It's also reasonably likely. There is a good chance they want you to get them started on a problem they don't know how to solve and then they will iterate off your solution. Happens all the time. Imo, if you are building a business in this space, you shouldn't let them do this to you. Other options: Offer to add some explainable AI visualization stuff into the app. Hide the best parts behind a web service and only agree to give them the source code for the gui. It sounds crazy but people will agree to compromises like this all the time.