Hi Marcus,
You're picking one financially viable game from a bunch of games made from your story specifications and political message. You even get multiple games spreading your political message and specified story for the cost of one game. This is spec work.
I should clarify that my position is based on being against the exploitation of artists. Offering a lottery to hobby artsts to create your content feels like exploitation of poverty - especially during this financially unstable time. If you removed the promise of financial gain from this project it would not be an issue.
I've updated the title of my previous post to be less inflammatory, I hope this helps. I still posit that this is spec work.