I'm sorry but it's incredibly simple. An ipad/phone is wasted on someone whose technological capabilities are that limited, tbh
I really disagree with this. My mum wouldn't know how to do it and she has an ipad and is perfectly intelligent. She's just not schooled in how these things work. This is a new risk that didn't exist in the world ten years ago, so it's no surprise that the entire world is not immediately au fait with how to close down that risk.
I've also just had a new iphone and where the "in app purchases" thing is listed has moved from where it used to be. If I tried to find it now it would take me a few minutes as I know where it used to be and not where it is now. I work at a computer all day so although am technologically quite unskilled, I have a rough idea of what I'm doing. But millions of people do not.
In any case, that's not how consumer protection works. Consumer products need to work for everyone, not just those who have sufficient technological capabilities to "merit" an ipad. Of course a 14 yo boy probably does have a pretty good idea of the technology behind it but no understanding of how credit works so got caught between the two worlds.
I'd guess this stuff will be legislated on shortly just as the mobile phone companies are having to implement credit limits so that consumers don't become liable for open-ended bills run up through thoughtlessness or through theft - not least because in all these cases the bill bears no relation to the cost of the services delivered.
(BTW the ASDA comparison doesn't work - ASDA don't let you walk away with the goods until you've paid. This is credit and credit is differently regulated - rightly because it's easy to get into trouble).