Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
some content may contain `` r-rated '' material , nudity , profanity , and mature subject matter . 

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