The privacy, security and effectiveness of the contact tracing app (CoronaMelder) in the Netherlands remain problematic. Read Joran van Apeldoorn his recent interview with Folia online where he discusses the pros and cons of the app or listen to the radio fragment from NPO Radio1.
The full article can be found here:
https://www.folia.nl/wetenschap/141299/door-alle-technische-problemen-wegen-voordelen-coronamelder-niet-op-tegen-nadelen
Or listen to the NPO Radio1 fragment here:
https://www.nporadio1.nl/binnenland/27466-de-coronamelder-app-heeft-meer-nadelen-dan-voordelen