system
A chat on subreddit /r/wallstreetbets
human
Three giant Chinese manufacturers were supposed to be making DRAM also right now which would have put Micron well into losses with almost no light in the tunnel for future profit. That's why it tanked below book value. 
  
 Trump banned two of them from american semi suppliers and they went tits up. Only one Chinese company survived which isn't enough to tank the market and Micron has a future again.

gpt
The surviving one also only makes very little and very shitty DRAM. It is many years behind, and Xi double pinky swears on no more IP theft.