You can see the example code and run it on the simulator without paying for the developer program. I think there is also still a student program that lets stude

You can see the example code and run it on the simulator without paying for the developer program. I think there is also still a student program that lets students run code on hardware for free, but yes, you need to pay for the developer program to run it on your own iPhone/iPad. The MIT license also means that if someone else wants to maintain it they can fix it up and put it back in the store.