But in CC BY-SA, if you transform the material, those modifications should be distributed under the same license (or a compatible one, if I got it right). CC BY does not have such a term.
So, what's that mean? If someone got my game under CC BY, can they change it and distribute it under a different license, even a closed-source license?
In the case of CC BY-SA, in the same scenario, this version should be distributed as CC BY-SA as well?