While I agree with your general point, how is it illegal? If I download the ISO from windows, install and keep using it without activation? They aren’t blocking me from using it and I haven’t circumvented any prevention they have in place. What’s illegal here?

More than old friends. India is heavily reliant on russian arms. Replacing them would be a slow, expensive process. Considering it is surrounded on two sides by aggressors with regular conflicts, jeopardizing relations with Russia is not an option.