Originally Posted by loki1138
Does anyone know if there is similar behavior (subfolders for dev functionality) for other linux devices (android ect)?
Thats an extremely vague and wide ranging question. Sure. There are devices out there which have developer mode activated by adding special files to it. Some need you to have a special firmware. Others will need you to have special hardware.
This backdoor is specific to the Kindle so looking at other devices won't help.