Why is my Spotify username random?

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Tags

1. #email
2. #spotify
3. #letters
4. #generates
5. #their
6. #random
7. #usernames
8. #however
9. #numbers
10. #automatically
11. #username
12. #users
13. #choose
14. #facebook
15. #address
16. #using
17. #which
18. #because
19. #account