Seems like you promoted them to Operator! Operator can't remove players or change the difficulty, but they can gain access to some slash commands that are listed in /help. ^BT

Check out our gameplay/how-to guides: bit.ly/3VaoWGg. If there's a game mechanic you want to explore deeper, your best bet is to visit community resources available online; these are usually player-curated and should help you with any in-game questions you have! ^FF