Privacy is a significant issue when it comes to personal data. We worry about it all the time. But, in these times, everything seems to be out in the open. Marketing agencies get hold of all our profiling data (demographics, transaction history, etc.) and pitch new products every day. Now when we talk about creating a common database of billion plus people as part of UID effort, first question that comes to our mind is "how safe will be my data".
It is imperative that privacy is taken seriously and built into the architecture to secure the data. But, at the end of the day, do the bottom of the society really care of their data privacy. I feel that educated upper class has the basic needs taken care and we have the luxury of debating all these. But, for the poorest of the section, it simply does not matter, at least for now. Eventually, when their basic needs are met, they will surely start worrying about these issues. But, that is several years away.
But, one way or other, when designing a system such as UID, data privacy should be of utmost importance from a system design perspective and cannot be compromised. Securing the data, avoiding tampering, and most importantly completely protecting data from leaking out are all part of architecture design we need to go through. Other aspects such as laws and policies surrounding the use of UID data are also critical.