Closing this thread, I think it's run its course.
The free edition is not allowed to be used for commercial purposes. However we are OK with people using crowdfunding to raise money to develop a game and buy a license as part of that. I'd recommend going to crowdfunding for this type of thing instead of posting here, since it encourages you to be more transparent and accountable, with good ways for funders to stay up to date with your progress and know that their money has gone to good use.