Are there countries in the world who block their citizens from accessing the FamilySearch website?
https://www.familysearch.org/legal/terms “This site is not intended for use in the Russian Federation and, therefore, should not be accessed within the Russian Federation. Moreover, due to local legal considerations in Japan, we do not generally allow residents of Japan to access this site. In some instances, subject to legally necessary measures and controls, we may allow limited access to specially authorized individuals and registered Church members in Japan.”1
China blocks FS. (And most of the rest of the "western internet".)2
An ancillary indication are the map pins on where Family History Centers are located.0