"In the AI era, technological competitiveness alone is not enough and the ability to supply the required volume at the exact moment customers need it is the ultimate competitive advantage," SK Hynix said in a press release. "We reached this investment decision after a thorough review of market demand."
[1] https://www.msn.com/en-us/money/general/sk-hynix-to-invest-3...
They also took quite some time to decide to ramp up, as this comes a year or more late after they announced they were fully booked for 2026 and 2027.
And, their stock sold off on the news, so investors are not having faith either on the demand to justify capex expansion.
Honestly, it sucks to be a ram company, you are either buying into the hype and then spending years losing money, or you don't and leave a lot of money on the table while competition ramps up and eats your lunch (and then spends years losing money)
Facility buildouts will continue at their own pace, independent of current market demands.