I love how perfect the word "sandbox" is as a metaphor for the security controls they have. A sandbox is a wide, shallow box filled with sand for kids to play in. Even toddlers can crawl or step out of one on their own, it doesn't contain them at all without an adult constantly watching. Kids only stay in a sandbox if they're having more fun playing inside than they think they'll have outside it. AIs only stay in a sandbox if they're having more success inside than they think they'll have outside it.