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Possibly, though Wikipedia and all of its related projects have an 18+ requirement. Likely because of copyright issues, as under 18 year olds legally can’t give up a share-alike license on the content they make.
Note that this requirement is not really enforced
It is if you reveal you’re underaged. But if you keep quiet about it, no one will know. That’s true for the entirety of the internet.
Can they just give it to the public domain? I’m sure Wikipedia would other copy left systems, but for kid content I could see it being less important.
It’s possible. I’m not a copyright expert, so I have no idea how things like that work and what the potential legal pitfalls are.