SSDs and USB flash drives in particular are full of sketchy NAND flash chips.
Some of those chips are straight up salvaged from other electronics. Some are "known bad" chips, hanging in by a thread while the flash controller is fighting to sweep all the bad blocks under the rug. Some are dead MicroSD cards - with the dead MicroSD controllers bypassed to access the NAND die directly.
NAND flash chips are "everything but the squeal" of electronics. There is a lot of chips that "somewhat work", and a lot of people trying to "upcycle" them into something that works long enough to be sold.
Some of those chips are straight up salvaged from other electronics. Some are "known bad" chips, hanging in by a thread while the flash controller is fighting to sweep all the bad blocks under the rug. Some are dead MicroSD cards - with the dead MicroSD controllers bypassed to access the NAND die directly.
NAND flash chips are "everything but the squeal" of electronics. There is a lot of chips that "somewhat work", and a lot of people trying to "upcycle" them into something that works long enough to be sold.