[shadowgovt]

The "under-18-year-olds can't enter into contracts" laws are, broadly speaking, derived historically from child labor protection concerns, and tend to be state-level law.

There's very real risk that legitimizing a contract with a child opens Google up to expensive-to-litigate criminal liability.

[wnoise]

Children technically can enter into contracts. But they're voidable contracts, so it's essentially no upside and only downside for those that would contract with them.