By that logic, no politician and government employee would be able to drive a car or have a job, since we also “ban” those for minors.

We’re not talking about a lifetime ban on social media, the argument is certain kinds of things are gated from people under a certain age because we know those are harmful and can negatively impact your entire life going forward when not done conscientiously, and most people below a certain age do not yet possess the capacity to make an informed decision about their use.