You need the raw data in order to be able to calculate statistics in the future about relations you don't anticipate now. Also keeping only aggregated numbers w

You need the raw data in order to be able to calculate statistics in the future about relations you don't anticipate now. Also keeping only aggregated numbers would mean you give up on data mining. I don't know if this use of data is "insane", but companies doing it get a clear competitive advantage over the rest. If governments decide to restrict it with some kind of regulation, there would be a clear cost in a less efficient economy. People are willing to give up privacy in order to gain convenience, otherwise they wouldn't be using these services. All these factors say we are going to see more data gathering in the future.