[bpodgursky]

The US legal code doesn't give them a ton of flexibility here.

Coinbase has to push the boundaries of US legal code interpretation in plenty of other places... picking "letting pre-teens manage accounts" would be a dumb hill to die on.

[eropple]

Coinbase already has verified you by your legal ID, though.

[throwanem]

Going into your profile on a trading app and saying "i am 12 and what is this", no matter the reason, seems like a reasonable signal that maybe you're not a customer I'm hugely concerned about retaining.