They just keep changing them, we were doing that for a while to block the Atlantis phishing link posts but as fast as we blocked them they just changed up to bypass the filter. Its actually easier to just to delete their accounts and posts all in one go, the bot posts around 60 to 70 times in quick succession filling up the newbie board then spilling into the other sections, 3 clicks on my laptop and they are gone. Admittedly sometimes they do persist creating new accounts over and over but seriously who buys into their shitty bitcoin scams anyway?