If you participate in any Black Hat schemes you will eventually get caught by Google or Yahoo! or your competition. Once caught you will be removed from the search engines!
Removal from the search engines is a manual process. Google and Yahoo! do not go looking for websites using Black Hat techniques. Instead they wait for complaints from users.
You will be investigated if someone complains about your site. If Black Hat techniques are discovered you will be removed from their index permanently. This removal is called "delisting."
They will make a copy of your website for their file in case you decide to fight them, and they will also keep your name on file.
Once your website is delisted you w...