Yeah, lots of good points raised in other comments but I agree. For young kids there isn't as much of an upside to freely roaming the internet.

With guidance, children can get all the good stuff while not having to face grooming, bullying, hate spam, or other dangerous traps online.

Once young people need to start giving back, publishing content, selling/purchasing things, networking, etc... then the benefits of the free internet really come into play for them.