This is the thing. They say its not voluntary in public record but ask them directly and they say its mandatory. Ive seen many old people coming to bank rushing to give their adhaar number so that their pensions don't stop abruptlylol. i sent a tweet to yes bank asking them about the nature of this request.
they did not reply on twitter probably to avoid being on record.
got a call from their corporate office. lady asked me my query. i told her that i wanted to know whether linking aadhaar with my yes bank account is mandatory or optional. she said it's mandatory. i did not want to waste my time so i said thank you and finished the call.
would bother taking it further when they start pushing it. but it's annoying to be honest.
waiting for when they would threaten to shut down my account like other banks are doing.