In China, this is already a criminal offence, while in Russia it is only partially so: ‘Using a VPN for criminal activities (fraud, illegal drug trafficking, etc.) is a criminal offence (punishable by imprisonment for up to 5 years).’ Other countries are currently only introducing document checks for access to adult content, but people are hacking VPNs, so it is likely that once the checks have been fine-tuned, they will introduce fines for circumvention, as in Russia, of $40 - 60 for each case. The circumvention itself and the existence of methods are unlikely to become criminal offences, except in certain circumstances.