To my knowledge, vBHosting violates the license.
If some one uses a hack to violate the license, then we absolutely can revoke their license. I believe it is our policy to not encourage such violations by not allowing such hacks to be published on
www.vbulletin.com or
www.vbulletin.org. I myself made a template mod for running multiple instances on one installation, but Kier wouldn't let me publish it even with a warning about needing multiple licenses.