Only 70k comments a day? As a someone who has been a reddit default moderator for 6+ years (I help out in more than 1 default subreddit), I'd say they're still small time. It's so bad over on reddit that even with a fully active staff, we have to utilize bots to automate much of the work. Without those bots, it would be impossible to have a community at the sizes we're talking. We simply wouldn't exist. He overstates…
Correct me if I'm wrong, but what you're seeing in the comment section of the Guardian is AFTER moderation has taken place – both longterm (blocking trolls) and short term (removing/blocking comments). So obviously it doesn't look as bad as what you're seeing WHILE moderating reddit comments and you can't really compare that.
It's like I'm saying "moderating reddit is easy, I barely see any spammers or trolls there" (as a user).