Yes, H&H are quick to kill most of the spam. But in the past week or so the amount of spam has increased substantially, and it's like a game of Whack-A-Mole trying to kill it as it shows up.
So...we just implemented a new tool about an hour ago that has already blocked 25 attempted spammer signups. I have to go through and kill all the existing spam accounts (and there are a lot of them), but you should see less spam now than you've been seeing recently.