Four years ago, while looking at search analytics of our travel blog, we found that people were searching Hindi terms and that too in Devanagari, but they were obviously landing on an English page. This led us to launch our Hindi Travel blog that soon garnered a compact but loyal readership without much marketing. The marketing spends on the Hindi media and I assume other Indian languages stay negligible.
Things are changing fast though. Instagram recently announced that Instagram Lite would be available in several Indian languages. Google just announced that it would show relevant content in compatible Indian languages that include major Indian ones. I can already see my Google Adsense account in Hindi; Google Maps should soon follow.