Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
the service supports only one account per game on a supported device . 

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