I'll say it again: the purpose of these laws as a whole is to surveil adults.
Even if this specific law isn't doing that right now, it's quite easy to see how it will eventually. Without surveillance, the law is ineffective. All you need to do is generate some moral outrage at how the children are supposedly bypassing the insecure system and bam, instant scope expansion.
Look at the metagame being played over the long term. It's got nothing to do with children and everything to do with control.