If that's the level you're after, E.setPassword seems good - or you can just move the console away from USB permanently with something like LoopbackA.setConsole(1) - then there's literally nothing on USB at all that someone can get started with.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
If that's the level you're after,
E.setPassword
seems good - or you can just move the console away from USB permanently with something likeLoopbackA.setConsole(1)
- then there's literally nothing on USB at all that someone can get started with.