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Roblox argues 8-year-old waived rights in wrongful death lawsuit
(www.courier-journal.com)
This is a most excellent place for technology news and articles.
Minors cannot be signatories to a contract. Nothing the parent does can change that.
If someone agrees to unlawful contract terms, those terms have no legal force, and depending on the wording of the contract, it could potentially invalidate the whole contract (though there's usually fine print about separability that deals with that eventuality).