Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
( e ) our `` forever '' subscription is paid for by a one-off upfront payment . 

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