We obviously wouldn't want the public to have access to personally identifiable data like GPS movements captured by phones, as this kind of data is highly sensitive. But having access to aggregated, (properly) anonymized data would be sufficient for many things, e.g. to see where local traffic hot spots are and how people commute to work. Giving out this data does not compromise privacy (if done right) and has a very little risk of harming the company that generated it.