I just discovered this huge story due to a recent update in the case:

https://foreignaffairs.co.nz/2020/08/20/mil-osi-security-robinson-twp-man-pleads-guilty-in-international-investigation-into-darknet-sale-of-child-exploitation-videos-and-images/

I don't rememeber this being discussed here and cannot find any past posts about it (Please correct me if I am wrong!)

https://www.wired.com/story/dark-web-welcome-to-video-takedown-bitcoin/

Allegedly, a massive web operation called Welcome 2 Video has been taken down after it's been discovered they are dealing in Child Sexually Abusive Material, aka CP.

From the governmental Department of Justice website:

https://www.justice.gov/opa/pr/south-korean-national-and-hundreds-others-charged-worldwide-takedown-largest-darknet-child

Allegedly BitCoin was involved in keeping this massive CP operation afloat.

https://www.thedailybeast.com/feds-take-down-welcome-to-video-a-massive-dark-web-child-porn-site