... I've seen so many Dapps that offer opportunities to free people, free data or create open markets. Cool, but the white paper doesn't say how to store these extremely private, sensitive data controlled by a highly developed set of international data security laws, does it? ...
which private sensitive data are you talking about? personal or transaction data
as long as you never provide (or let it access) your personal data, there isn't anything to worry about
however, transaction data included in blockchain cannot be made private
the idea of blockchain is a public ledger that can be verified by everyone in the network