The moderator agreement is viewable at https://stackoverflow.com/legal/moderator-agreement . There is nothing equivalent on Reddit.

If you see a diamond moderator violating anything described in that contact Stack Overflow (the company). There are serious repercussions for a moderator violating that.

Note that this only applies to moderators - those users who have a diamond following their name. Other users are not moderators (and this is one of the sources of frequent confusion - terming anyone who can vote to close a question as a moderator).