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A City on Mars: Reality kills space settlement dreams
(arstechnica.com)
This is a most excellent place for technology news and articles.
AFAIK it only prevents weaponization of space.
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.
It prohibits countries from claiming sovereignty over territory beyond Earth, but the colonies themselves can still be sovereign. Assuming the treaty continues as it is it just means that countries won't be able to draw borders around vast lifeless regions on Mars or the Moon and claim jurisdiction over them, they'll still be able to build cities there and the cities will be theirs to control.
Treaties like these lapse or get amended over time as the realities of life make them obsolete, though. I expect that once there are cities on Mars there'll be borders as well.
Yeah it's just that the sheer scale of planetary colonization kind of makes this a problem for the year 4,000 or so.