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Tens of billions of dollars of investment specifically to keep up with Moore's Law.

It's basically akin to something like the Manhattan Project or the Apollo Program, just something initiated by private corporations rather than a government-directed investment program.

The market does. New stuff needs to be sold every year, and needs to be some amount faster to find a buyer. The cost of development is minimized while still reaching that goal, limiting the gain to no more than necessary.

That's like saying that the storke brings babies. It doesn't really answer the question, it just pushes it off for another day.

Why don't we see exponential density growth in other products? What would that even look lke anyways?

One thing driving Moore's law is the every generation of computers is used to design/simulate next generation. It's a positive feedback loop.