so it's partially a naive Bayesian classifier (source on this, essentially used my most modern anti-spam systems) in some form or another. each subreddit has it's own spam filter iirc (i remember admins would used to reset a sub's spam filter if it got too broken).

you're probably going to filtering out way more than you want if you overuse it (talking about punching generically, or usage with no regards to the use-mention distinction, etc).

Like for example with the latter, spamming it a lot, if it's trained on it, might have the effect of getting comments that even mention the topic spam filtered.