Nothing takes very long.
It has been said Brueckner is a devotee of the dark web. From reading about it any investigation into it is a very long and convoluted affair and as soon as investigators crack one aspect the perpetrators set up another better encrypted one and so on.
However there is an example here for German prosecutors who may wish to keep someone like this off the streets,
SnipThe "exceptional gravity of the case", led to prosecutors asking the judge to consider a discretionary life sentence.
https://www.bbc.co.uk/news/uk-england-birmingham-43005287It didn't happen but twenty odd years is quite a tariff.
Bruckner too was into filming the humiliation of his victims. He did it in person not remotely as Matthew Falder did, so that must count for something.
SnipHe did not actually meet or physically touch any of his victims; all of his crimes were committed using the dark web.
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In addition to the National Crime Agency (NCA), the investigation to uncover his identity involved GCHQ, US Homeland Security, Europol, Australian Federal Police, New Zealand Police, and the Israel Police;[25][8] it lasted four years.[26] Will Kerr of the NCA feels tech companies gave less than ideal cooperation with the police during the enquiry. Kerr maintains accounts were closed down possibly preventing police identifying other victims and identifying patterns of offending. Kerr fears this may have delayed identifying offenders and Kerr wants government action to make tech companies cooperate better in future.
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On 16 October 2018, the Court of Appeal reduced the term of imprisonment to 25 years, with an extended licence of 8 years.[2]
https://en.wikipedia.org/wiki/Matthew_Falder#:~:text=Making%20indecent%20images%20of%20children%20etc.&text=Falder%20pleaded%20guilty%20to%20137,six%20years%20on%20extended%20licence.