I don't buy it when news hits that the FBI took down some ransomware gang or seized bitcoin or what have you. I've never heard of a single former FBI hacker, I don't know of anyone who would want to work for them (who wouldn't pick another agency first). Their pay is terrible and they disqualify almost everyone who has the background of a hacker. They must have some other agency do the deed and then they take the credit out of legal necessity.