I don't care if it's trivial to implement and impossible to bypass: it's an effort to eliminate anonymous Internet browsing/commenting because everyone over 16 has to submit ID as well. Its the end of free speech on the part of the Internet the UK controls.
A cynic might wonder if this is the real aim.
Context: the government has objectively become increasingly authoritarian, with the partial elimination of jury trials, the criminalisation of peaceful protest, the use of anti-terror sentencing laws for activities that are clearly not terrorist, and other actions which set up ideal conditions for an oppressive dictatorship.
It's hard to take the idea that this is about concern for teens seriously when the PM bypassed civil service vetting norms to make a known friend of Epstein ambassador to the US.