I dont see how it matters, this is for the usecase that there is already an established and verified account with e.g Facebook. Many betting or crypto sites do passport and video verifications, Facebook can do the same. Then all the child has to do is login via the Facebook app as usual, on iPhones via biometrics but it doesn't have to be biometrics. It can be any kind of 2fa or tripple verification. Authenticator code + email + sms + app login, simply cutting down on the likelihood that someone is a fake person. Then the parent can see which verifications were done by the child on the Facebook dashboard to see if the kid is alive and able to do verifications instead of whatever else the attacker claims. I think you meant to say that the bank verification process can be socially engineered... well first of all to actually do that you also need a lot of fake documents and expertise and the bank has to utterly fail at their job. Which hopefully prompts governments to require in person meetings at the offline location for future bank accounts.