An international law enforcement operation codenamed ‘Operation Passionflower’ has shut down MATRIX, an encrypted messaging platform used by cybercriminals to coordinate illegal activities while evading police.
Note: It’s not the service by run by the Matrix.org Foundation. Different service with the same name.
It’s also not that huge a breakthrough, to be honest. I recently finished reading the book “Dark Wire: The Incredibke True Story of the Largest Sting Operation Ever”. It highlights Operation Trojan Shield, in which law enforcement from multiple countries actually ran an encrypted messaging app used by criminals worldwide called ANOM. For over 3 years law enforcement was able to read virtually every message criminals sent over that service. It ultimately led to over 1100 arrests across multiple countries, seizure of 40+ tons of drugs, millions of dollars in various currencies, etc.