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They also come with a web browser that runs a full coding language, javascript.

The operating system is supposed treat end-applications like games and browsers as untrusted and provide isolation against them. The real kicker here is the bug in the `fs` service.

The thing is where is the line between a programming language and a game

What if your puzzle game is based around programming robots? How complex do you allow the language?

Judging by how full of slop is eshop I doubt they even look at what they allow.