It *is* hard to make memory, especially HBM (...which is what the AI market wants, and is what the manufacturers are focusing on) and bringing on new capacity takes years. There's the additional wrinkle that the manufacturers we have left are the ones who survived periods where the market was glutted with oversupply in the wake of previous shortages.

These decisions play out on the order of trillions of dollars and 3+ year horizons. They're also incredibly sensitive to other geopolitical issues (Taiwan, issues with Chinese tech capability vs export/import controls, etc).

There are a lot of valid discussions to be had about how we got to this state of oligopoly: Taiwan's consistent sponsorship of its semiconductor capabilities and the subsequent concentration of technology (expertise, capacity, etc), the lack of investment/support (and ceding of technical leadership) in Western countries, the various rivalries with China and the implications of it becoming a first-class producer of semiconductors at scale, etc. None of those discussions and none of their potential outcomes can substantively change that we're going to continue in this situation (massive price increases, spotty availability, etc) for at least the next 18-24 months.