Here I am again. Sorry for the delay but after everything you guys wrote, I needed to process everything and do some research. I feel like I'm totally digitally illiterate on this fora! Door Anoniem: I know this paper is not about DigiD, but Google Play Services should behave in the same way with DigiD as it does with COVID-19 contact tracing apps. To answer some of your questions directly: “is efficiency at the expense of my privacy?” Yes, to make full use of DigiD you have to have two-factor authentication enabled. And to enable two-factor authentication, you have to choose between security and privacy. Thank you for that paper! I did not know about data collection from Google Play Servies, I suppose it works the same for Apple Store? Because when I did some research on the Apple Store, I found out about the new Apple "privacy labels." Now you can see for each app which "data is used to track you" and "data is not linked to you" and we can also see it for the DigiD app! and you can deactivate ...