So it seems like they use steam names of people that played the game at some point to act as bots to fill lower ranks.

Played a bronze game against a player- ThePyroTV and wanted to look him up after the game. So I first looked on Twitch to see if he was streaming. He wasn't, I thought it was odd and looked him up on Steam. He has logged 0 hours of Minion Masters lately, and hasn't unlocked any achievements with the game since 2017. I don't mind them using bots but they're kinda deceptive about it, and using others steam names as filler is a little sketchy.