Ciris: I SWEAR I went through the first page of those like 20 minutes ago... :/ But I shall go at it again! My good comrade is also trying to ban them from the mysterious back-end system we use, we will see how effective it will be.
toxicTom: Currently the bots put out spam every few minutes in each thread. But we already had occurrences with multiple threads per minute - for hours. To slow them down maybe first lock the user accounts - it takes them a little longer to make new accounts. I've reported two of the quickly spamming bots to Firek yesterday and they were gone a few minutes after each time. It doesn't help much to ban the slow spamming bots though since they will just make new accounts.
We're trying to battle these guys by changing their emails, blocking them from forums etc. in the backend here in the marketing area. There's an independent deadly force in the support team, who do their best to react to info via support channels. Hopefully, together, we'll conquer (at least some of) the spambots!