Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
all purchases of digital content are final , except as required by law or as described in our mobile and rift content refund policies . 

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. OPTIONS: ["Jurisdiction", "Content removal", "None", "Limitation of liability", "Choice of law", "Unilateral change", "Arbitration", "Unilateral termination", "Contract by using"].