Wait until they figure out that modern day games are constantly evolving and changing so the concept of "unavailable" exists today for stuff that's less than a year old. Maps, in-game content, in-game characters, etc. It's all short-lived and hardly static.
> If something is not legally available then copyright law ought to make it eligible for free distribution
What about stuff that's in flight? Or your IP that you've developed that is taken off the market and you are incorporating into another product? Or stuff you put out there and it flops because of timing and you plan to relaunch again in 2 years? There are many situations where this doesn't hold up.
You sentiment makes sense but implementation is tricky.