Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
7.1.5 the placement and ranking of listings in search results on the airbnb platform may vary and depend on a variety of factors , such as guest search parameters and preferences , host requirements , price and calendar availability , number and quality of images , customer service and cancellation history , reviews and ratings , type of host service , and/or ease of booking . 

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