Any investment in Moon enterprises are premature. The effects of human activity on Earth's moon is unknown.
Earth's moon is a satellite with a gravitational balance with a planet. The only celestial body that should be even closely considered for human habitation is a planet. So, the focus of Mars is not unrealistic, but, to mess with Earth's moon, at this point, is craziness.
Andrault, Denis, Julien Monteux, Michael Le Bars, Henri Samuel. "The deep Earth may not be cooling down." June 2016. Earth and Planetary Science Letters. Volume 443, pp. 195-203.
...An alternative mechanism (click here) to sustain the geodynamo is mechanical forcing by tidal distortion and planetary precession. Motions in the outer core are generated by the conversion of gravitational and rotational energies of the Earth–Moon–Sun system. Mechanical forcing remains efficient to drive the geodynamo even for a sub-adiabatic temperature gradient in the outer core. Our thermal model of the deep Earth is compatible with an average CMB heat flow of 3.0 to 4.7 TW. Furthermore, the regime of core instabilities and/or secular changes in the astronomical forces could have supplied the lowermost mantle with a heat source of variable intensity through geological time. Episodic release of large amounts of heat could have remelted the lowermost mantle, thereby inducing the dramatic volcanic events that occurred during the Earth's history. In this scenario, because the Moon is a necessary ingredient to sustain the magnetic field, the habitability on Earth appears to require the existence of a large satellite.
This is only one article. The exact effects of human activity on the moon is not known. The moon is Earth's satellite long before it is Wall Street's lust for money. The scientific community has absolutely no concrete idea of the effects of any disruption in the moon. It has a direct relationship with Earth. What this scientific article proves is that Earth is still a mystery as well.
Geologists often have stated, "Earth is becoming old and cold." Evidently that conclusion is outdated and quite possibly dangerous to life on Earth.
Knock it off.
When the USA went to the moon it was to prove the frontier of space is within the grasp by the USA. There are no other countries that have been able to accomplish such a mission. Currently, outer space is static; humans have not altered any of it's properties in a real way. The day there are explosives going off on Earth's moon, that reality changes.
There hasn't even been any drilling into Earth's moon to know what is under the surface. There are many craters, but, that is not an indication that explosive charges are minimal compared to cratering.
This is probably the most interesting view of Earth's moon. This is it's south pole. This south pole shows a circular pattern to some extent which might have formed as it cooled.
A closer look at this view shows more than impact craters, there is a flat area at 7 o'clock and another at 5 o'clock and another at 9 o'clock. There are also mountains on the moon. Flat areas and mountainous areas outside of a dent by an astroid is a geological feature of the moon. The moon was hot and molten at one time. I believe some of these geological features appear on the moon due to it's cooling. There is no way to state a flat surface without cratering is caused by craters. That is nonsense. There is no erosion on the moon, so any idea the flat areas are caused by the atmosphere is pure idiocy.
Until we understand the entire moon as well as we understand Earth and its relationship with Sol there is high risk of adverse effects on Earth.
Additionally, how much of the moon's weight can Earth tolerate? Every time a space vehicle brings back moon rocks, it is adding to the weight of Earth.
Matter is finite. Matter is a material substance that occupies space, has mass, and is composed predominantly of atoms consisting of protons, neutrons, and electrons, that constitutes the observable universe, and that is interconvertible with energy.
Within Earth's planet system (not the solar system, just the planet) matter is finite. That may not be the case with the universe, but, it is with Earth. Earth has just so many molecules of anything regardless of how they are used by human activity.
Every time someone brings back matter from the moon it adds to Earth's matter or mass. How much rock can come from Earth's moon? Mining the moon is making it lighter while Earth is becoming heavier with the moon's rock. Given the relationship with Earth, how much of the moon's mass can be carried by Earth without effecting its current physics and physical composition?
The moon is to much a mystery to say it can be safely mined. That is pure unadulterated hubris.