Ask HN: is GitHub susceptible to robots?

am fairly new to GitHub, and i noticed some accounts [for example https://github.com/threejs-cn] are following like 22k users and it/he/she joined on October 8, 2013 - i noticed because i now have 4 followers [of which two are spams -- i think]

I got followed by this account too today, but when ever I click on the profile it gives a 404.