The hard part about groups operating on the internet is like dropping a stone into a fish pond...all the fish are gonna scatter and hide. You gotta decide if making a move is worth scaring them off. That's why a lot of CSAM get raided and then the feds sit on them for a while....they gotta make sure they have everyone in the pen so to speak. So a lot of times feds just sit there for a while doing nothing and just collecting evidence, then they drop the nuke.
There's a bit of this, but also the other hurdle that you guys aren't going to like hearing. Everyone, even these "people" who do these sort of things have rights that cannot be impeded on, even if they really should be. This isn't the wild west where you can just rooty toot shoot up Bad Bart because he raped, murdered and killed. FBI/DHS/ATF/DEA have to operate under some relegation of respecting the rights of individuals, even to people who clearly do not deserve them. After all, if it weren't for those protections, these government agencies would be no different than Mussolini's Facista Blackshirts, Hitler's SS, or the Bolshevlek Secret Police.
And in regards to multinational terrorism with multinational perps, you have to jump A LOT of hoops in regards to the constitutions and rights of the individual accordingly to the rights of said nation, while also at the same time having to juggling multinational embassy work. Case in point, with Raidz, he is currently an Iraqi citizen, living in Iraq. There are two hurdles in bringing him in,
1. The Iraqi constitution is different than the constitutions of the Five Eyes intel coalition.
2. The Iraqi government doesn't play well with outside governments and is slow to move on those cases.
That being said, there is literally no embassy/government on Earth that tolerates this sort of action whatsoever, however, with certain countries, there are additional games of politics that come into play, which is why you see a lot of those rings being operated from said countries, or utilizing members/grooming persons of certain constitutional protections from within those countries.
See the NLM slayings by Slain764, who was slow to bring prosecution towards because of his age, and Sweden is very slow to prosecute any minor under the age of 17 for any crimes outside of murder.
When you start digging into these people and circles, you'll see a common thread, the main operators are in countries like Turkey, India, Iraq, Poland, Russia, Sweden, Pilliphines; because those countries either really don't care, or are slow to play ball with multinational investigation; which is why 764 was marked as a Tier 1 Terrorist organization by the DHS, equatable to ISIS/Al-Quadea, because it forces the hands of multinational governments to play a little nicer to stop the insanity and bring the people responsible to justice.
Literally, the meme: "CSAM ring operating out of my shithole country? I sleep; Multinational Terrorist Organization operating out of my shithole country? I AWAKE"