Here's the YET:
Aadhaar is voluntary—but millions of Indians are already trapped

"Court rulings have ensured that the programme—at least on paper—is voluntary. That, however, has not stopped it from becoming entrenched in daily life. From pension schemes to nutrition programmes for kids, and women’s empowerment scholarships to insurance payouts, the government and many businesses, including banks and cell phone operators, have been pushing for it, at times even arm-twisting citizens to sign up for an Aadhaar number." etc. And after a series of instances where all the Aadhar data was shown to be wide-open to hacking, nobody trusts anymore that their data is going to be safe.