"They" can't. Stop the scare-mongering. If you're not a good terms with your local government, you have dozens of alternative jurisdictions to select from. Even if you can't find a single friendly government to setup under, The Silk Road stayed up for over two years. China isn't even pretending they're not censoring the Internet, and their well-funded censorship agency still has to play whack-a-mole with VPNs.