This is the best summary I could come up with:

However, you’ll likely find them inside knock-off SSD brands that sell for ridiculously low prices on platforms like AliExpress.

Instead of throwing the NAND away, which increases electronic waste, the factories recycle them into cheaper products or sell them to local companies, giving rise to obscure SSD brands on the Chinese market.

A Chinese data recovery YouTuber recently took apart a ShineDisk M667 (M667-120G), a 120GB SATA SSD that retails for around $13 in China, and found some alleged SK hynix-manufactured NAND for Apple devices inside.

According to the YouTuber, it’s reportedly SK hynix’s E2NAND, which appears to be a multi-chip package with an MSP controller with embedded ECC support.

It could have come from a factory making NAND for Apple or some third-party vendor ripping them from defective iPhones.

For example, a recent report revealed that some vendors recycle server ICs into consumer memory.

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Can confirm - when our company is done developing a product, we’ll sell the NAND to a third-party vendor that uses it for stuff like this. Sometimes (most of the time), we sell them perfectly good NAND. We don’t even sell pre-qualification NAND - they won’t buy that. Although the NAND reclaim market has been pretty much killed by falling NAND prices recently.