If this guy builds an app which is forcing users into paying upfront and then hiding a money back guarantee in some hidden text then that is deceptive. And Apple suffers since they allowed the app to be sold on their store.
Well, they could allow the app to be sold outside their store, and then they wouldn't face any reputational risk from it.
I don't really see how this is deceptive either - if the app clearly states that you're paying for it upfront, and what the price is, then how are you being deceived? If you aren't willing to pay for it without trying it, then you can just not use it.
Really? Because I'm pretty sure Windows still carries the reputation of being a virus ridden software which was almost always caused by third party programs.
The service is sold outside the store (website). The apps to use the service are free on all platforms.