Micron's products have relatively serious potential network security issues
Micron makes a lot of products, from NAND and DRAM chips, all the way up to consumer & enterprise/datacenter DIMMs and SSDs. I can see an argument about SSDs
maybe posing some kind of security risk, but not the raw chips. This definitely feels vindictive. I guess it's one of the few big US suppliers they can afford to ban (i.e. as opposed to AMD, Intel, or Nvidia).
From what I've heard, Micron didn't even sell that much into China, to begin with.
BTW, Crucial is Micron's brand for consumer products.