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EDIT: yes, besides aesthetics, the main (and more important) reason is the dependency on some disposable online resource.

• coldtea 10y ago
  If you are using code hosted there, then you are dependent on that online resource, whether you write their name in your code or note.
• wlll 10y ago
  1) it's Github, so "disposable" is a fair mental leap and 2) fork and/or vendor the dependencies if you're worried.