Yes it does. The claim before - that kids could just come across porn in their everyday internet use - was extremely dubious anyway, the OSA has now pretty much stopped even the possibility of that.
No, it hasn't. "Accidentally running across porn" isn't even something that routinely happens. Have
you ever accidentally encountered porn in your routine internet activity? I haven't - not since the 90s which is where old white parliamentarians still think the internet is. Nobody "surfs the web" any more. Kids look for porn because they're kids and they're curious, and they're even more curious about the things that are forbidden, and you know that. This is why the parents/guardians have to have a serious conversation with them about sex and sexuality as soon as it is practical to do so.
It's akin to gun control in the UK, it is very difficult to get hold of guns to use in a crime, but when you are looking at a population of over 60 it does happen but that doesn't mean gun control doesn't work.
That's not a good analogy. There isn't a VPN for gun control.
As ever in these types of issues perfect is the enemy of the good. Nothing in practice will be perfect, but that doesn't mean we shouldn't put in place good controls.
All this is doing is putting extra steps in the way. This will be enough to deter some, sure, but children can be extremely resourceful and if they really want to get at the porn, they will. A better analogy is that you lock the front door of your house, but if a burglar really wants to get into your house in particular, they will break a window. The lock on your front door only deters casual, opportunistic burglars.
If the existence of porn, what it is and what it is not, and the existence of predators and how to recognise them - if these things are in the open, known, and understood, then kids won't have to go behind their parents' backs. Ignorance and secrecy are dangerous. Knowledge is power.
Meanwhile, the OSA is also providing an unnecessary and unwanted barrier to adults, for whom porn is completely legal.