So all the governments of the world are in on the plot to hide the true nature of the Moon. They go as far as faking gravity research data from satellites. (Seems like it might be a bit easier to just not fund this research in the first place, but whatever.)

What’s inside the hollow Moon that requires this kind of coordinated long-term secrecy by governments that mostly don’t agree about anything? Russia, America, China, India, Japan, Europe — they all do moon research, so they must all be part of this.

I'm confused. If all the data from probes and satellites is an elaborate fake, what difference does it make to send a few astronauts? They can't report the real data either.

The reason why we haven't been to the Moon is that it's very expensive to go, especially with contemporary safety standards. The Artemis program is projected to cost around $100 billion. There's nothing on the Moon that would provide a direct return on that investment.