There's a reason why Micron and Nvidia are the crown jewels of American technology right now and for the foreseeable future.
To give some context, Intel started making DRAM, I think they were actually the company that came up with modern memory techniques. They exited the market and pursued a more lucrative moat with CPUs.
If somehow you get around the patent issues, you're now faced with huge research and development costs, fabs to build, processes to sort out and all of that has very high failure rates.
Last time I checked Micron was the largest patent holder in the world and even for them this is a hard area where they are number 3 in the market.
If the rich decided to buy all drinking water, you would probably be saying that's okay, making water is difficult, shortly before dying.