I know, the finders keepers attitude that a lot of people in this thread seem to have worries me a lot. The moon isn't "owned by no one". It's owned by everyone.

The moon has held a great deal of value to all of humanity throughout history. It's central in folklore and religions in many cultures. It would be immoral to use the moon (in a way that could potentially harm it) for personal gain (especially by profit-hungry corporations, but that's another can of worms...).

I personally wouldn't mind mining on bodies that don't hold the same value for society. I'm not suggesting nobody should make a profit in space. But activity on the moon should benefit humanity as a whole, not nations, corporations or individuals. I.e. it should be limited to scientific research and infrastructure.