Which is why many are suspicious of existing secure chat apps, and why the French government hosts its own server instance of Matrix, because you cannot even trust your allies.
This happened before of course in Switzerland with Crypto AG, the provider of secure encryption equipment to over 100 countries, which was owned by the US's CIA all the time. And ironically it is always what the Chinese are suspected of doing.
Busting criminals though of course is a good thing as long as innocent people are not being spied on (like one of Germany's Allies were caught doing on their Chancellor).
See Australian cops, FBI created backdoored chat app, told crims it was secure — then listened to 9,000 users' plots
Hundreds of arrests already in Oz, details of European and US ops to be revealed soon