Not for parents alone, not dependant on device
The Disney tool was an app people needed to download. In this case Acision enables subscribers to black people from spamming/bullying/stalking you. Depending to what extend the operator likes to enable this. Users can block others through a website (alike O2's bluebook), by sending an SMS, by visiting a mobile website (and typing in the number) or even by downloading an operator SMS/MMS client that offers additional features such as forwarding to email, block,, auto-reply... Even when the phone is than out of reach, battery is empty, etc The rules still apply.
for parents the copy feature could be interesting if a parent suspects their teens are being bullied but they have not real sign for this going on. Of course it is up to parent and kid who will setup and control these features.