Elon Musk and Mukesh Ambani face to face regarding satellite spectrum, what is the whole controversy?

There has been a war between industrialists from all over the world regarding the satellite spectrum in India. On one hand businessmen say that spectrum should be licensed directly, while on the other hand many businessmen say that spectrum should be auctioned. Elon Musk, the world’s richest man, says that spectrum should be licensed directly, while Mukesh Ambani, India’s richest man, says that spectrum should be auctioned, not directly licensed.