The proof is in the pudding. And to establish the fact or truth of a statement, there needs to be proof. What denotes adequate proof? Proof typically comes in the form of evidence at the scene of a crime or a witness. Often times, it ends with "my word against yours."
Think about this: When an online customer is trying to cash in on a warranty or uphold the contents of their membership agreement, there aren't witnesses or any piece of tangible evidence to prove this. Therefore, how do we prove that their warranty isn't expired? Prove that their membership was paid in full?