You're forgetting a lot of the original imageboards (eg. Blueboard) and calling them "hate and revenge porn subreddits" is a gross oversimplification...... eg. r/jailbait is NOT a simple revenge porn subreddit! It was a straight up you know what subreddit! It's a shame to see Redditors defend Michael Brutsch (u/violentacrez A.K.A VA A.K.A "Pimp of Reddit") as a "troll" even till this day! Apart from this, there were also a lot of disturbing subreddits during the mid '10s like r/beatingtrannies, r/beatingcripples, r/strugglefuck, r/askarapist to name the few.
OMG! I did this a lot as a kid!