Sounds like the servers running the service were compromised, not that the authorities were actively running the service.

They just sat back and let it continue until they decided to move on the information gathered.

No, they were forced to act because it became known that the servers were compromised.

"EncroChat sent what it called an "emergency" text to its users on June 13 saying it had been compromised"

>No, they were forced to act

Well, they really weren't considering they could have just not raided. The circumstances changed and they decided to act on what they had.

After that text the clock was ticking, and rapidly so.

It's a pretty interesting bust when you get into the details, highly recommended.