Maybe they don't but they have realized that their spam profiles on drupal.org are too short-lived to get them much traffic. As a result of this, the number of new spam profiles seems to be down.

As a side note: In part due to the spam profiles and the google traffic that they generated drupal.org served more than 30 Mio pages in March. This is an increase of about 38% compared to February with 22 Mio viewed pages.

The bigger part of this surge can probably be attributed to DrupalCon at the beginning of March.

Here's a table of the number of 403 pages by month:

Google's webmaster tools also tell me that "naked girls" is currently the 19th most popular term connected with searches and drupal.org (about 1% of results). This should change again once google has dropped the blocked profile pages from its index. Unfortunately, there is no feasible way to unlist all the pages in their index as you can only enter URLs one-by-one in the appropriate form.