That's something created/accepted as a reasonable state of affairs simply because no one could imagine the resources needed to record and track every person everywhere (Or, we could - but it was fiction). Being in public was considered seen by others. Perhaps an occasional photo being taken.

Perhaps the old ideas that "you have no privacy in public" or "if you can be seen then you can be recorded" and so on just need to be revised? Should we reconsider what it means to be "in public"? Perhaps people should be granted some form of privacy protection also when "in public"?