You dont even have to worry only about your own/current government. Take the Netherlands, with detailed census data (conveniently as punchcards) about their population before the German invasion. With the threat of an invasion looming some suggested to at least trike out the information about religious believes. Unfortunately this didnt happen. Amsterdam had one of the highest rates of deported Jews for a reason.
It's funny how much more sense this made on old-fashioned dial-up connections. Back then, as far as I remember, there was no data limit as such. The only thing that counted was connection time. Rather than sitting there reading something while generating ticks, you could better download much of the site and disconnect. An old form of rush to idle.
