Or you can get great conversations going, help struggling strangers get up and become pillars of their communities. Which sometimes requires deleting snarking comments, ban aggressive repeat rule offenders and deal with occasional personal attacks.
Moderators have powers, use power and are often not at liberty to reveal all what went into their decisions. Moderation on any scale is however a team effort and is then subject to scrutiny, discussion and review. Power tripping moderators will be removed by the team and in communities with a sole moderator who is on a power trip it will not thrive.
Subreddits thrive mostly based on their name. If a power tripping mod gets on top position of a good name, there is very little you can do. You can try to start an alternative but all new users will go to the other one.
Just think about what it means to be top mod of a cities subreddit. You can trivially just delete conversations you don’t like.