The user you linked made a single post and a single comment on the topic. You spread a ton of posts and comments across several subreddits.
The subreddit mods might have reported you to the admins as a spammer - that's what they do when they see someone breaking site wide rules. Like it or not, they are under no obligation to communicate with you about it beforehand. It's also possible that none of the subreddit mods had an issue with it and you happened to be noticed by an admin who saw you were breaking the rules.