[Update - 12/26/2025] - Taiwanese outlet, CNA, has received a statement from ASUS regarding the DRAM rumor and stated that it currently has no plans to invest in a memory wafer fab.
https://wccftech.com/asus-enter-dram-market-next-year-to-tackle-memory-shortages-rumor/
How hard can it possibly be, you just get those casings that go around the ram, and then fill them up with ram juice. They could even recycle old ram by topping them up again!
/s
Yep! The most expensive equipment they might need is a magic smoke compressor, if that.