Reddit isn't very strict with its moderation, unlike HN. My understanding is that reddit attempts to only block out-and-out spam / crapflooding / malicious link

Reddit isn't very strict with its moderation, unlike HN. My understanding is that reddit attempts to only block out-and-out spam / crapflooding / malicious links. There are ways to circumvent it or at least check to see if you've been banned as well, so it's not a perfect defense against a tenacious troll.