To answer your first question, all current and former Minehut staff members are robots. Upon becoming a Minehut staff member, the admins will create a copy of you, using Superleague's copier, and they will make that copy a robot. The staff member is then taken with the other staff members and forced to play chess for the rest of their lives. There are also several non-staff players that are robots. I will work on making the full list later but here are a few: Vocall, Skycape, TacticalModz, and AttendantFox.
Hope this helps on your journey to learn about the robots of Minehut,
Jackson