Accounts on the robots.txt

I recently saw that in GitHub’s robots file the following lines appears:

Disallow: /ekansa/Open-Context-Data

Disallow: /ekansa/opencontext-*

Disallow: /account-login

Disallow: /Explodingstuff/

I’m just wondering what the hell that supposed to mean?

Why are these accounts listed as Disallowed for scripting (and how can I get there?:wink:)?