You're mixing up false positives and false negatives. Nobody is going to be incorrectly blocked under this system unless they lost their ID, and the fix there is getting a new ID.
Some kids skipping the block sometimes isn't catastrophic, especially because there won't be all this peer pressure to join adult social media when 90% or more are blocked.
Some kids skipping the block sometimes isn't catastrophic, especially because there won't be all this peer pressure to join adult social media when 90% or more are blocked.