Kinda like prohibition isn’t it? Take away something the people want and those people will be forced to circumvent authority to get it back. In the case of GV Mobile and the larger Google Voice,
Apple AT&T banned them from the App store so their developer is packing up and going to unlawful grounds. GV Mobile hit Cydia a few hours after it was officially banned from the App Store. The developer, Sean Kovacs, is also working on a Web App that will also work on the Pre.