[throwaw999]

And how would you know if there was a backdoor that allows the government to pull anyone's data? Even if the app is validated by reliable third party in current version, there's no mechanism stopping a malicious update in few months.

Once it's mandatory to have such app it's game over. Doesn't matter what algorithm is being used, doesn't matter who developed it. It's insanely easy to abuse this. The government will simply deny there's any sort of backdoor and gaslight people who say otherwise.