There are over 300 companies with over a $50B market cap. The money is there.
That doesn't mean they all have $20B in cash to spare, OR the expertise to pull it off. Even China is still playing catch-up and nobody else is even trying because to get started in 2026 would mean poaching a bunch of people with nasty non-compete clauses to even get started planning.
There are documented cases of these same 3 companies colluding to constrain supply, even openly discussing what the target price of DRAM should be. Some of the people who were found guilty got their fines or even prison time and then came back and got promoted.