https://www.bleepingcomputer.com/news/security/europol-unlocks-encrypted-sky-ecc-chat-service-to-make-arrests/

European law enforcement authorities have made a large number of arrests after a joint operation involving the monitoring of organized crime communication channels after "unlocking" Sky ECC chat's encryption.

Sky ECC is advertised as a secure messaging platform used by around 170,000 individuals worldwide. The service's US, Canadian, and European servers are being used to exchange over three million messages each day.