It takes $10-$20 billion dollars and 2 to 4 years to set up a foundry, TSMC took about four years to set up their location in Arizona and there is a hell of a lot more involved with what they do. It’s not impossible to do it in less time the Chinese certainly will.
If a company is motivated and has the money they can get it done. I think those three memory companies are counting on people to be stupid.
Intel, Nvidia, and Qualcomm certainly thought they had Apple over the barrel…