This is mainly a German page, sorry for that, but if we find relevant articles in English we are happy to provide them here:
Apps reveal location data and in terms of GDPR even sensible data about religion. Amongst many other apps a muslim prayer app provided data to the U.S. military:
Read the full story on Vice/Motherboard:
https://www.vice.com/en/article/jgqm5x/us-military-location-data-xmode-locate-x
So you really think you can not be found with “anonymous” data sets? Well!
(Quote: )”While there were no names or phone numbers in the data, we were once again able to connect dozens of devices to their owners, tying anonymous locations back to names, home addresses, social networks and phone numbers of people in attendance. In one instance, three members of a single family were tracked in the data.”
Read the full article in the NY Times : https://www.nytimes.com/2021/02/05/opinion/capitol-attack-cellphone-data.html
A good site on why algorithms need to be watched in spanish:
http://justiciaalgoritmica.org/