Why is trello free?

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Tags

1. #trello
2. #offers
3. #priced
4. #number
5. #unlimited
6. #mainly
7. #month
8. #users
9. #class
10. #power
11. #cards
12. #version
13. #lists
14. #business
15. #features
16. #boards
17. #service
18. #board
19. #oriented
20. #companies