Why did Marvel sell Spiderman to Sony?

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Tags

1. #rights
2. #bought
3. #superhero
4. #before
5. #independent
6. #disney
7. #owned
8. #since
9. #developing
10. #studio
11. #publisher
12. #series
13. #movie
14. #started
15. #marvel
16. #comic
17. #characters
18. #returns
19. #movies
20. #office