It depends on which you're talking about, the DVD Firmware cracks or the JTAG System hacks. The DVD Firmware cracks allow for playing of pirated games. The JTAG System hack allows for running of arbitrary code.
I'm talking about the DVD Firmware hack, since I'm talking only about piracy.
MS always does a massive large rolling ban wave with the new Dashboard updates every November.
I don't think they did one in 2010, though, did they? And are you certain about one month to ban? I was under the impression that they had become more lax with bannings, but it may just be because the acquaintances I have who pirate have resigned themselves to stay off XBL.