Why would it be illegal for minors to own bitcoin? What a ridiculous thought.

Also, there's a difference between what is illegal and what will actually get you in trouble. Having your parents use their identification to help buy you bitcoins isn't getting anyone in trouble and while legality is questionable, there's literally a 0% chance of it being a problem.

Of course, minors shouldn't be gambling bitcoins, but that's another story.

Remember, all of these laws are to protect minors. A minor who is signing a contract isn't doing anything wrong - the person who is having him sign it is the one who is the "bad guy." It's important to help minors turn into successful businessmen (while still protecting the ones who need protection) instead of turning them away.