It's actually tough to find a jam currently that:
- has a decent amount of participants
- generous timeframe
- not some horror/spooktober/spookvember theme
- sensible rating criteria
An while I opposed the open source thing in the first place, I now find it intrigueging to be able to look at the code if I wonder "wow, thats cool, how did the game do that?"
That being said - I think you can close the source after the ratings are in. And I think AI is not able to profit from this jam a lot. Too many different technologies involved.
But tbh: I already wondered - if this is backed by big corp - why are there no prices involved?
OP: I dare you to create a jam with the same set of rules just not the open source/github one. I would join and submit there given that enough participants show up