Anti-Spam/Leeching Suggestions

Response to OP.

Limit the speed at which newly registered users can create new threads.
A. Can't really do that since they could just post and then we'd have to limit posting aswell and that discourages new members.

Create a feature built into Cuddles which notify staff of (relatively) new members with unnaturally quick posting activity, which could be disabled per-user.
A. Probably extremely hard to implement which would give a lot of false-positives.

Check if there is at least one (or more) word that actually exists in the dictionary within new users' posts.
A. Doable, but might be resource intensive. It's possible to just copy paste other posts instead.

Prevent users from copy+pasting the same thing into multiple posts within a relative period of time.
A. Pretty sure we have something like that already.

Prevent users from posting content that only contains quotes.
A. That's doable, but again they could just add a word or spam something random.