> My comment was automatically banned by the auto-moderator because it had a link to Wikipedia and no other links. I tried reading the subreddit rules before posting, but it's pretty hard to find this rule -- indeed, it is not explicitly stated as far as I can tell.
It is at least currently in the subreddit rules page, as linked to on the main site.
"Wikipedia, or any other single tertiary resource, used by itself not a suitable basis for a comment in this subreddit."
https://www.reddit.com/r/AskHistorians/wiki/rules
In general on reddit, if you've had a comment removed and think it's not right then message the moderators.