The US has so many "other" agencies operating domestically that nobody can keep up with all the mil, mil/gov, gov, private sector informants.
Everyone is flooding the internet with bait and the FBI has to respond to it all only to discover its all from the US gov, mil as part of domestic missions to keep budgets and make great over time.
Great for the growth and funding of each agency but the FBI then has to work out what is a crime or just another US agency creating a legend around some other mil/gov backed informants or some decade long deep cover effort. Thats expensive, risky and a massive duplication of effort. Everyone under watch needs 6-9 person teams, support, over time and has to be undetected in very invite only closed groups under investigation that are run like cults or other spy rings..
If the group been watched for months turns out to be another US agency/US mil front, a friendly gov operating in the US with the total blessing of another part of the US gov, thats an epic waste of expert skill for months or years.
Such other agencies used to operate internationally as that was their mission. Now the same work load and limited domestic funding that was once all the FBI's has to be shared with ever more bureaucrats, mil and other new intelligence teams, contractors, private academics, politically backed think tanks, ex mil now fronting private sector groups, well connected dual citizens offering front companies.
The only way to get that budget back is to get good domestic press that political leaders can understand.
If not other agencies will hold the keys to decryption, tracking, support services, intelligence gathering and keep running informants that totally clog up the FBI's own complex case load.
Decades of experience is lost to well funded groups in the US mil/gov who never expected to have any role in the USA then get more of the domestic budgets.
Long term the FBI seeks total encryption access without any difficult requests to other US agencies, bulk data collection domestically and internationally, voice prints for everyone entering the US, been in the US or talking about the US.
The aim is to bring it all back to the FBI, spy hunting, crime, total decryption, international intrigue. Even local city and state task forces case loads are now expanding US wide without needing FBI level funding or even sharing details about operations in the same areas.
The trust issue over informants, methods, funding, budget expanding good news in the press is getting very complex.