Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
please note : section 19 of these terms of service contains an arbitration clause and class action waiver that applies to all airbnb members . 

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