Why do Dropbox links expire?

Related questions

1. What is the difference between Dropbox and Dropbox business?
2. What is a Dropbox business account?
3. What happens when Dropbox expires?
4. Is Dropbox for free?
5. What happens if I don't renew Dropbox?
6. Is Dropbox safe from hackers?
7. Is Dropbox free for commercial use?
8. Is Dropbox business really unlimited?
9. Can I have two dropbox business accounts?
10. Why is Dropbox more expensive?

Tags

1. #computer
2. #links
3. #viewable
4. #dates
5. #files
6. #shared
7. #ability
8. #folders
9. #safer
10. #added
11. #dropbox
12. #months
13. #compromised
14. #someone
15. #others
16. #expiration
17. #device
18. #expire
19. #sharing
20. #still