Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
for the purposes of our forever subscription , forever constitutes 100 years or until the date headspace ceases to commercially offer the products . 

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