India has a lot of languages, and a lot of these languages seem to have their own writing systems. So why are there so many languages in India and Southeast Asia, as compared to somewhere like Europe or China?

SOURCES:
https://en.wikipedia.org/wiki/List_of...
https://thediplomat.com/2019/07/the-s...
https://en.wikipedia.org/wiki/Brahmic...
https://omniglot.com/writing/tamil.htm
https://en.wikipedia.org/wiki/Pallava...