Earlier quoted context omitted.
What laws would be broken in this case?
Tortious interference, also known as intentional interference with contractual relations, in the common law of torts, occurs when one person intentionally damages someone else's contractual or business relationships with a third party causing economic harm. https://en.wikipedia.org/wiki/Tortious_interference
I think it would depend on the local jurisdiction's definition of the tort. A purchase/refund scheme would not induce Apple or the vendor to breach their app store contract, but it would deprive the vendor of its expected economic benefit.