I was reading the website of the Secret Hitler board game which states the following (emphasis mine):
Secret Hitler is licensed under Creative Commons BY–NC–SA 4.0. That means you have to give us credit for the original, you're not allowed to profit from it commercially in any way, and you have to license it under the exact same CC license. You also can't submit anything to an app store or anything like that.
This isn't an exhaustive list, and it's your responsibility to make sure you're not infringing on our thing.
However, assuming the hypothetical app is not for commercial purposes (i.e. it's free, contains no ads and no in-app purchases), I don't see distributing it in an app store being against CC BY-NC-SA 4.0.
Am I missing something here?
NOTE: I'm asking about content licensed under CC NC licenses in general - I'm only taking this example because it's the only one I know that explicitly interprets the license this way.