It is only locked to make people pay more for a game. If it can be accessed through a hack then it is there on the product you paid for. The locked content is meant to be played, unlike some left in code a la Hot Coffee mod. This is not something that will stop here. You will end up paying more for less if this practice continues. The disturbing part is sneaking it by through children.
I understand its locked so they can get more money but that's called a business model. Hacking that lock is also known as piracy. Would I buy a game that made me pay for each level separately? Yes, if the value proposition is there and no, if I don't find it to be fair value for my money. i haven't been exploited at all. I willingly bought into the business model. I understand your worry about everything being governed by this business model. Its the old slippery slop argument and it's valid in some form here. I actually find it intriguing that you sense they are trying to introduce this model by training children at a young age to accept this; that could very well be the case but they aren't the ones making the purchasing decision. One would hope two things here: First, when kids are adults or are able to make their own purchasing decisions, that they will evaluate it carefully and secondly, the business models available for various forms of content are competitive and variable enough that we don't live in a world where the slippery slop scenario becomes reality.