You are free to copy, distribute, transmit and adapt our data, as long as you credit OpenStreetMap and its contributors.
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Does not this apply to non-revenue generating actions?
In the same paragraph they also say
If you alter or build upon our data, you may distribute the result only under the same license
Does not that mean that if I use the plug-in, then I can only distribute my game under Commons Open Database License (ODbL), i.e. I can not sell it (can not earn money from it)? So I would have to make my game freeware?