So they must use older equipment, which has low productivity for state-of-the-art memories. Because of the "sanctions" there are now Chinese companies that have progressed significantly in semiconductor manufacturing equipment, but the effect of this will also take some more time to manifest.
Nonetheless, if the 3 big memory producers will not be able to increase the availability of memory until 2028, then until then CXMT will grab with certainty a major part of the market (they have already grown quickly until 10% of the market, from a negligible percent previously).
Was that also capital looking for returns?
https://pcpartpicker.com/trends/price/memory/#ram.ddr5.5600....
The exception is CXMT, which uses ASML DUV machines in a less efficient process.
For DRAM, CXMT were only 1% of the global supply 3 years ago, and are now already 10%. They are growing extremely rapidly.
If you are concerned about consumer memory - smartphones, laptops, desktops, then this is what CXMT are making. CXMT do make HBM too, for AI accelerators, but their volume there is held back by sanctions.