You can find public statements in the last 12 months from Samsung and Hynix about their aversion to scaling out production or increasing supply because they are concerned about profits.
Hard to know who to believe, on one side there are the absurdly high prices and statements from companies and on the other hand there are strangers posting on HN that it's actually all fine.
The memory business has always been extremely cyclical, and I doubt this time will be any different. The manufacturers have learnt this, and therefore to avoid boom followed by bust they try build for what they perceive to be longer-term more sustainable demand, not just knee-jerk increase demand to meet an immediate shortage.
The risk to any of the manufacturers, especially those with most market share, would seem to be if they are not all acting in sync. Micron's consumer brand, Crucial, had a great reputation, but now they have exited that business in favor or devoting all their capacity to currently higher margin products... will this come back to bite them later if they want to re-enter the consumer business?