The thesis that the IVC language may have been related to Dravidian is dead as a dodo. Only Tamil nationalists pursue it. There's really nothing to the Elamo Dravidian hypothesis also. For a time it was pushed feverishly by a David McAlpin. The theory rested on a slender footing. Essentially there was a Dravidian affiliated language called Brahui spoken in Baluchistan by a small number which raised possibility of IVC language being Dravidian and at another remove, an Elamo Dravidian language family. But the Brahui language is now accepted by most experts as a medieval period (i.e., 1000-1600 AD) immigrant into the highlands of Baluchistan from Central India. This has basically blown the stuffing off the Dravidian hypothesis for IVC - not that it was ever very strong. The Dravidian language family, in the opinion of experts, continues to be an isolate confined to southern India.
This may be an underhand method to promote Indian content developers. Other than that there's no rhyme or reason to such bans.
In the 1960s they imposed a crippling tariff on Hollywood movies just so the government didnt have to take a stand on Indian moviemakers clamoring for liberalizing laws showing on-screen kissing and nudity. They felt Hollywood movies got away with bloody murder whereas what they could show would not even quicken the pulse of a nun.