forum moderators do not choose who gets to admin on any said server.* the various servers you see are owned by various private owners. Those owners can do whatever they want on their server including appointing their own admins. if they want to ban you because you had the wrong hat, that is their prerogative even if it isn't right.
*I am a forum moderator for these forums but I am also the senior admin for the official servers. As i pretty much run what is left of the official servers, i get to decide who gets admin or not on those servers only. Which at this point is just NW_Official_NA1. The other forum moderators who are not members of the server admin staff do not get a say in who becomes an admin or not.(or rather, no more of a say than any other common person out there. They do not get to vote with the server admin staff) the server owner Vincenzo can at any time remove admins or do what he wants to the server.