I'm focused on Apple because I do not believe there is any chance this could happen without them.
SonicForces, on their own, is not going to be in any position to separate a child from $16,000. (nor is virtually anyone else.) No parent is going to give their credit card to SonicForces.
Apple, on the other hand, created the unique ecosystem where they know their devices are in children's hands, where they sell games aimed at children, where they exercise a strong editorial voice as far as what is allowed on any app in their store or not, and choose to allow apps that a small child could easily be taken of advantage by. They also know many of their non-technical adult customers, who of course are obligated by life to have an account with the phone company including a credit card on file, will not fully distinguish between Apple, the telco, and the random 3rd parties in the app store.
If I were the regulator or legislator looking at this, my focus would be on Apple because if I fix them I've gone a long way towards fixing the overall problem.
Don't get me wrong, if I had to I'd go after the scummy software company too, but it'd be like pulling a weed: you know there'd just be another one around the corner if you don't fix the core issue.