this is just an informal post after seeing the lots of hate against him for making his courses paid.
videos are made paid by him because educational content don’t pay much regardless of how much views you have. i
am sure he was not earning enough after he kept more teachers in his youtube channel(after trying to expand his channel).
now with 60 lakh subscribers, he can at least get 1,00,000 premium subscribers.
that 1 lakh subscribers will pay him 200 rupees. that will give him 2 crores in premium. just imagine!
another reason is that people used too much adblockers.
likewise another reason is that people didn’t buy his pendrive courses.