Pretty much every security camera, most of the networking equipment, action cameras and set-top boxes run Linux from NOR flash (cost and simplicity reasons- no

Pretty much every security camera, most of the networking equipment, action cameras and set-top boxes run Linux from NOR flash (cost and simplicity reasons- no FTL, IIRC better retention). Altogether it's probably billions of devices. There are also quite a few lines of MCUs without built-in flash memory and those typically boot from external NOR flash.