Question

why has cricket a large viewership in india , not in china or russia

Answer 1

China or Russia were not ruled by British. British brought cricket to India. If you see the history of all cricket playing countries, all were ruled by British (according to me). British ruled India for quite long.

Answer 2

Initially cricket was organized between different parts of the British Empire, not sovereign nation. Moreover, India is the oldest cricket playing nation so cricket has a large viewership in India not in China or Russia.

Another reason is that the technological changes revolutionized cricket.