I know that studios exists to make money, and that they do that by controlling the distribution of the media, but it’s very sad when parts of our culture can get lost like this even though it’s preventable.
As it stands now most preservation projects start looking for copies of work once the copyright has expired, which is long enough for many things to already be lost, unless copies are found from so called "criminals" who made their own archives in violation of copyright law.
Sadly, I don't think there is a reasonable way to do this...
Why not? A hypothetical preservation law could require the submission of all servers, assets, and instructions required to make the game useful. Doesn't matter which version as long as the submitted package is usable as a whole.
Many other countries do the same: https://en.wikipedia.org/wiki/Legal_deposit