Why do reviews disappear from Yelp?

Related questions

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4. What is a yelp sound?
5. Are yelp reviews legit?
6. How many people use yelp daily?
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9. Is yelp a social media platform?
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Tags

1. #wanted
2. #counteract
3. #directory
4. #fraud
5. #susceptible
6. #could
7. #became
8. #valid
9. #popular
10. #because
11. #filter
12. #therefore
13. #reason
14. #reviews
15. #consumer
16. #fraudulent
17. #business
18. #decision
19. #impact
20. #creating
21. #algorithm
22. #unfairly