Example #1: How do you automate a test for what happens to your streaming music app when a phone call comes in? (This was a real scenario a client couldn't figure out how to automate any other way.) Example #2: You're a car company and have a mobile app that controls parking your car. You have a business (and possibly legal) requirement to test the app with the same unmodified hardware your users will use. (So you can't only use simulators.) Example #3: You make wearables that measures steps taken. How do you test the wearable to make sure it's logging steps properly? (You shake it with a robot.)

Every company that makes a device (phone, car, wearable, anything with a touch screen, etc) has a secret robot testing lab.

I didn't know all of these examples were real business problems (with the associated big enterprise budgets) when I started the project. But after enough of these conversations, I realized there's something there.