Wow -- this hadn't even crossed my mind. Regarding Android devices (mine included):
Could I just hide a tiny linux OS inside a charger? Then when someone plugs in the device just auto-mounts the SD card and copies away? Is it that simple?
I'm not sure if this is what you meant but mine always has a prompt of some kind (varied between phones) for connecting to pc. I'm not sure if there is a way to disable that or if it was phone specific.
icons popped up in the notification bar that show its being mounted through USB for all the android devices i have ever owned: droid, htc thunderbolt, galaxy s3, xoom...
Could I just hide a tiny linux OS inside a charger? Then when someone plugs in the device just auto-mounts the SD card and copies away? Is it that simple?