I think it is reasonable to assume Valve will leverage automation heavily. Why pay someone to update that list when a script could do it?

Thank you for linking that.

Was that in what was shared above and I missed it or was that said somewhere else? Could you share that if it is easily available?

The point was simply that Debian is not responsible for Ubuntu or PopOS, but they can still interact cooperatively. Downstream benefits from the work Upstream does and downstream can contribute upstream so everyone benefits.

I would be inclined to think Valve doesn’t want the responsibility of making it a “broad” OS. More likely is there are other open source communities that are taking that on and Valve is willing to work with. Much like we have Debian -> Ubuntu -> PopOS.