In many countries, ATM machines cannot be operated by individuals.
As much as we wanted to believed that this is the case, still there's no doubt in our minds that the arrest was due to the fact that they have been tightening their anti-bitcoin/crypto stance. This is just another guise but it makes sense if you see how India in the last 6 months has slowly showing their colors as to how they're going to take this new 'revolution'. If I'm not mistaken, India's 'demonetization' last year was to reduce the money flowing to the underground or black market, and they even hinted moving to digitized money. However, with this kind of move, it seems that they are moving backwards again. While majority of their neighbors sees bitcoin on a positive light, they seems to be taking a different approach.