I'm confused, Need a Reddit expert here. Shared a post in r/startups. In 24 hours it jumped to the top #1 post of the year (927 upvotes). Spent 10 hours reply

I'm confused, Need a Reddit expert here. Shared a post in r/startups. In 24 hours it jumped to the top #1 post of the year (927 upvotes). Spent 10 hours replying to hundreds of comments the whole night. But suddenly, out of nowhere! I get this email: - "You're banned from this subreddit". Why? What's the point of Reddit then? If a moderator bans someone who's upvoted by so many users? Help me understand this.