I'm concerned that such validation would need to be proprietary and locked down with some sort of user hostile TPM-like-thing in order to be effective. If this wasn't the case, then anyone could fork the foss tool and create a bypass. The average child won't do this, but a few will and some adults probably will over anti DRM principles and then it's published and widely available.
These are ideological litigious fanatics among a much bigger herd of worried parents. They’ll attack any bypass tool and risk degrading the features of normal stuff like browsers and url parser libraries; totally ineffective at solving the problem but doing something in the eyes of unsophisticated constituents.
