We're constantly and actively adjusting our filters to catch this stuff. But as soon as we adjust, so do the pesky spammers. Believe us, you aren't seeing a fraction of the spam that our system is catching and not letting through. We're trying some new tricks too, so fingers crossed. Unfortunately this all is just a big game a whack-a-mole.
Ambassadors and Moderators destroy spam and spammers as soon as we seem them. But we're not on the forums 24/7, so sometimes they sit and fester for a few hours. Don't worry, they'll typically get zapped within a day.