There is no difference between suppressing arbitrary content and suppressing illegal content. It doesn't matter if the decision to block comes from a dictator or the people's vote. The technology doesn't care. You either have the ability to block content or you don't.
This is untrue. China (to survive as a dictatorship) may need to suppress any content. Without respect for laws.
Most country i have been to don't have this need. They need their law to be followed and use different means.