GCHQ scans the entire telecommunications network. They & the NSA have Quantum CPUs interfaced with their existing supercomputer setups, which can ensure they can trace even through proxies, VPNs etc: it's why they've also been able to break the encryption behind the 'Dark Web' and compromise such; it's the 21st Century equivalent of Bletchley Park & Alan Turing cracking the Wehrmacht's Enigma codes, and Churchill knowing more about Shitler's High Command than Shitler did.
Dunno about the NSA: perhaps they do the same and supply the FBI with the relevant data intercepts, but Scotland Yard's Operation Ore has backup by GCHQ; they share relevant data with the FBI. Interpol too.
But then, if data on inferior subhuman paedophiles can be found by mere members of the public...:
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https://news.sky.com/story/paedophile-hunters-banding-together-to-track-down-suspects-11541152
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https://uk.news.yahoo.com/eight-men-unmasked-online-paedophile-hunters-killed-investigation-finds-084303835.html
...be afraid. Be very afraid.
Perhaps GCHQ has been supplying data to not just Britain's police.
Name and Shame. Not only the ultimate deterrent to those who dare to so much as think they have the right to think the way they do, but is lethal.
But when Paedophilia effectively became Thoughtcrime since 2009: the Coroners & Justice Act, I suspect we now know why some... thing daren't come to my country and argue the toss outside Scotland Yard - with the press present - and say that Britain's laws aren't 'Sane'.
Because if his way of thinking was soooooo 'superior', thus - as per his 'claim' that his way of thinking is 'Moral' and 'Sane' - why let said not-sane 'Laws' stop him from coming to Britain and proving not only the Metropolitan Police but the ones who give them those legal powers & laws - Parliament - just down the street from Scotland Yard on the Thames Embankment are wrong?
Because just his 'Opinion' would make him immune to prosecution. Amirite, Mary Jane Sicko...?!
Every second you're not on the next flight to Heathrow/Gatwick to do so, you admit you're wrong. The only one stopping you from proving our laws aren't 'Sane' and you putting our police & MPs on the right track of legislation: yours, is you.
What about all those poor nonces named & shamed into removing their subhuman selves from our superior anti-paedo society: and those who named & shamed said subhumans don't have a telecommunications network-scanning supercomputer with Quantum CPU.
But perhaps someone at GCHQ is basically the Lucius Fox to the Batman that is the leader of those Paedo Hunters.