Getting the government involved does not in any way impact the ability of individuals to do it. The national Film and Sound archives are national treasures that provide a critical function when it comes to preserving media that hobbyists can’t duplicate. Their value for the arts/humanities and the preservation of culture simply can’t be overstated. For starters, a national video game archive would presumably store source code/as many generations of builds as possible, a lot of which do not exist on the world. They’d also follow proper backup protocols for these assets.

There is no downside.