I agree with your emphasis on 'as' in 'as a game engine product', and I think you're making a good point. My worry is about 'otherwise commercialise', in cases

I agree with your emphasis on 'as' in 'as a game engine product', and I think you're making a good point. My worry is about 'otherwise commercialise', in cases where the ability to have fan made levels is an advertised feature, as is often the case. But I agree that this is less of an issue than I first thought, and appreciate your explanation.