How can users be sure they have thought about all important factors?
Let an expert in the issues of the Indian diaspora come up with all the "right" criteria.
Life is too short to spend on investigating dead ends: mutual interest must come from both parties at once.
Discretion is paramount.
How about a service which will determine mutual interest without communicating any profile information?
Who would want to become a sitting duck, a permanent target for all kinds of marketing campaigns?
Easy to write, paper privacy policies are easy to break when the temptation becomes too strong.
What is really needed is a service which can work without collecting a database of overseas Indians.