The point is that this kind of control will drastically reduce under 18s consuming content that they shouldn't. We don't need the all of society's controls to be flawless.
If you were old enough to pass for 18 yeah a newstand might sell you a magazine. Most would not if you were clearly younger. And you needed to pay for it. Most kids (especially young kids) don't have any money.
And then you had one magazine. Still photos. And it didn't show anything but naked bodies. No real sex, the hardcore stuff was only in adult bookstores.
It was virtually impossible, pre-internet, for an average kid to find a way to spend hours and hours looking at an endless stream of hardcore porn.
And that is before you consider that what you're ultimately doing, even if your blocking strategies were successful, is steering kids towards the darker markets where illegal and actually harmful content isn't removed and that don't care about your ID laws.
- Benjamin Franklin
The US is always against regulations when they don't benefit their companies, whether it's social media, AI, porn, tobacco, or weapons.
The EU and Asia are doing a great job protecting their people from harmful US goods and services. On the other hand, South America and Africa are poor continents with little power to negotiate.
We went from being up in arms to complete acceptance of this as the norm shockingly fast. Well under a year.
I live in a European country now that prides itself on "individual freedom", and basically can not visit outdoor public places. When I suggest an establishment ban smoking on their terrace, they find it unthinkable. This was the very reaction people in the UK had, _until it got passed in law and everyone was fine with it_
We don't, but we do need them to be at least close to best-effort. This is a nonsense law, implemented in a nonsense way. Clearly nobody cared whether it worked or not, and there's either an anterior motive or it was something the current government (whose idea it was not) couldn't back out of without being labelled "pedo-loving scum!".
Unfortunately, I can't let your examples go without comment either. Age restrictions on the sale of tobacco caused a dive in the numbers of children smoking since those shops absolutely stopped selling to children when the penalties came in. I know, I was one of them and none of my friends could get cigs from shops anymore. As for the height restriction bypass; we're not in Looney Tunes, that's not a thing.
But I'm afraid they're only there to satisfy the puritans. The average shitty content that you 'consume' will still be fine.