It's not funny at all, I agree with this good decision and see it as very positive for children.
I have two young children who play with mobile phones all hours of the day and they started accessing Facebook, YouTube, etc. and started learning things that I don't want them to learn at the moment.
It is true that in the end it is inevitable for them to see these things, but at least they have grown up a little and are beginning to realize the seriousness of these bad things.
This is a very good measure I must confess. I so much love this development. I have had this issue with my Nephew and I am even confused on how to solve it. I believe he is so innocent to start using a phone with internet connections. So,I bought him a tablet which only uses a hotspot connection and only when he is connected he will have access to internet.
He now tells me everyday about his mates that got mobile phones. So, not buying for him makes him feel inferior to his mates and that can also be called a peer pressure. It is just a two ways thing.
But, what was implemented in OP is the best thing.