This ruling could be a huge benefit to those parents who have been funding their kid’s in app purchases for stupid game upgrades that a lot of kids simply clicked on in-game without thinking of (or purposely not caring) how much of someone else’s money they were spending. Now, if kids want to buy an IAP, and they’re directed to a separate website that requires getting the (or stealing their parent’s) credit card and going through the payment process, it may slow down these types of purchases. Of course it could also make for one additional layer of complication when a parent sees charges for something they never authorized on an unfamiliar website, unlike when they see charges come through from Apple.
And yes, this is coming from a parent who went through exactly this, albeit with a kid playing xbox, not on iOS. Watching hundreds of dollars a month disappear, it was hugely frustrating and stopping it took more than a month of back and forth with Microsoft, not to mention getting the one child to understand money doesn’t grow on trees or magically show up in your bank account.