[codedokode]

Cooperating with law enforcement cannot be a fraud. Fraud is lying to get illegal gains. I think, it's legally ok to lie if the goal is to catch a criminal and help the government.

For example, in 20th century, an European manufacturer of encryption machines (Crypto AG [1]) made a backdoor at request of governments and never got punished - instead it got generous payments.

[1] https://en.wikipedia.org/wiki/Crypto_AG