The only way they could successfully implement it is with constant live video surveillance, otherwise parents who oppose the ban can easily get around it. Which is going to be at least a double digit percentage of the population. And the police don't even have the resources to investigate theft and robbery, let alone go after millions of parents for helping their children create social media accounts.
> parents who oppose the ban can easily get around it
Irresponsible parents are irresponsible parents, and they can do much worse than letting their children wander on the Net alone. IFAIK no law at least here forbids parents from giving alcohol or tobacco to their children, even though it is forbidden to sell those products to them. Toxic social media are mostly the same.
Although the topic is a ban, I think the idea is less about forbidding and punishing, and more about helping - albeit in questionably manner according to some - helping parents with "regulating" the access of their children to the Net. Of course, the easy answer is to recommend giving them dumb phones instead of smartphones, but really a smartphone is too useful to be ignored around high-school age.