Don't worry, we are winning the fight.
To elaborate, in the beginning of March, dozens and dozens of Spambots registered, thankfully Yama fixed security measures, so they stopped registering. However, the Spambots that registered before are still posting threads... And I can't ban them before I make sure they are really spam bots. (In other words, I wait until they post a spam thread/reply, and then ban them).
Their numbers are dwindling, so the forum is gonna be fine soon. (I ban like, 4-5 Spambots a day).