I don’t get the “Game Porting Toolkit” they made, content-wise it basically looks like a regular Wine packaging - much like what Proton is, but then it has one of the strangest licenses I’ve ever seen for something designed to help development and shipping.
To paraphrase, you can’t include any part of the toolkit with your product. Not the development components, the runtime components, the translation layers, nothing. So good luck using it to actually ship game ports, since that would be a license violation.