And of course you don't want everyone is looking at you,specially your assets that may attract Bad elements if expose how much you are handling.
And privacy on Public sphere could work in such a way that people could choose to become private/anonymous but their interactions with the public can be recorded, and saved on public system. The recorded activities have to be immutable, thoroughly encrypted, and the keys to decrypt them can only be controlled by their owners... or could be decrypted without their owners, mainly by the law enforcement agencies through the laws and public consensus, once their owners have committed serious crime.