It also prohibits countries from claiming sovereignty, and it actually used the Antarctic treaty for inspiration.
https://en.wikipedia.org/wiki/Outer_Space_Treaty
Which is not to say that it’s exactly the same situation as Antarctica, but the treaties are more similar than you might assume.
I would love to see the cost/feasibility of boosting to a stable/graveyard orbit. The ISS is massive and not built for that kind of maneuver, but it would be great to be able to preserve it for the future.