The way Tor works is that anyone can set up something called a "hidden service". It's basically a website that can only be visited by using Tor.
These websites have a unique URL. For example, Bitcoin Fog's URL is http://fogcore5n3ov3tui.onion/ If you try to visit that using a standard web browser, it won't work. But if you use Tor browser, then it takes you to the Bitcoin Fog hidden service.
Some of those websites were devoted specifically to delivering CP. Now the FBI's reasoning goes like this: anyone who was visiting those websites were very likely visiting them for the purpose of looking at CP.
The FBI delivered an exploit designed to identify as many of those people as possible. So even though no CP was being served, people were still accessing the URL. The malware collected the MAC address and hostname of the computer, then submitted that info to an FBI server. So those people were apparently added to a centralized FBI database.
One way that database might be powerful is if e.g. a politician (or any other government worker) were was identified as a visitor of one of these websites, because whoever controls that database now controls them.
These websites have a unique URL. For example, Bitcoin Fog's URL is http://fogcore5n3ov3tui.onion/ If you try to visit that using a standard web browser, it won't work. But if you use Tor browser, then it takes you to the Bitcoin Fog hidden service.
Some of those websites were devoted specifically to delivering CP. Now the FBI's reasoning goes like this: anyone who was visiting those websites were very likely visiting them for the purpose of looking at CP.
The FBI delivered an exploit designed to identify as many of those people as possible. So even though no CP was being served, people were still accessing the URL. The malware collected the MAC address and hostname of the computer, then submitted that info to an FBI server. So those people were apparently added to a centralized FBI database.
One way that database might be powerful is if e.g. a politician (or any other government worker) were was identified as a visitor of one of these websites, because whoever controls that database now controls them.