Here is the headline sparked my question:
Europol shuts down thousands of websites linked to global nihilist network

The headline actually does not capture what the group actually did, according to article text:
The groups recruit members through social media platforms and online gaming communities before encouraging them to commit acts including animal torture, violent assaults, self-harm and the production of child sexual abuse material.
Note also another important detail (at least for me):
Victims are often blackmailed into remaining in the groups, with perpetrators threatening to share intimate images or videos with family and friends.
This sounds like how standard mafia or KGB/FSB works.
Another notable aspect is this:
Some of the groups also use far-right symbols and terminology to promote their ideology or provoke public outrage.
I guess the more accurate headline could be like this: “Europol shuts down thousands of websites linked to global misantropic network that included far-right groups”.
I also suspect that somehow Kremlin involved into this network. At least erosion of ethics worldwide is something Kremlin would find beneficial for their goal of world domination.
PS: I am not a big fun of nihilism or misanthropy but so far I heard these words only related to philosophy books authors like Nietzsche or in internet whining about unpleasant life and being unlucky. With than being said, I never heard before it can end up with mafia-like behavior or end up becoming a destructive sects.