I'm new to game development and considered using the Unreal Development Kid for a test game. The website states it is free for non-commercial use. I know that games that can be obtained free of charge are considered non-commercial.
However, my mind came up with the question: What are free-to-play games with cash-shops categorized as? Not saying I'm planning to embed one in my test game, that would be just non-sense.
A quick Google search couldn't come up with any answer, especially since I'm unsure of what to search.