Google handles search abuse reports on sites by compiling the submitted and discovered data, then adjusting their search algorithms to counter the identified abuse method next time around. This is an effective method of dealing with abuse and violations it seems -- the most practical method, anyway. As an example, abuse such as using the style sheet display property "none" to hide a slew of links was reported to or discovered by Google, and now their algorithms can identify this type of index-inducing violation and respond accordingly.