Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
a tripadvisor affiliate may act as an advertiser 's limited agent solely for the purpose of transmitting your payment to the advertiser . 

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