http://tenchan4v5bnlu3gatyjyctlsb25asvncbz4pr7gmomhsrvyx5zfpcad.onion
If age verification was to be done correctly each device has a finger print and a database could be created of hardware fingerprints of 'child' devices. Those child devices would be blocked from those platforms, it's easy to bypass with a vm or spoofing, but if a kid can do that then they can probably use TOR.