Haven't thought about it much, but I find I'm vaguely in sympathy with the ban on under-16s on social media - but only because I'd ban everyone from algorithm-driven social media if I was in charge.
As for the practicality of the under-16 ban, I'm highly dubious. But I think it's another of those performative laws which governments don't actually care about enforcing (also see the ban on vapes).