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