Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
airbnb reserves the right to require that listings have a minimum number of images of a certain format , size and resolution . 

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