TL;DR; Feds pose as an advertised on KAT.CR and finally find the bank account associated with this torrent website and in the process Apple, Facebook, GoDaddy and coinbase helped in finding the owner that lead to his arrest.
More recent records show that an IP-address linked to KATs Facebook page was also used to access Vaulins Coinbase account, suggesting that the Bitcoin wallet also assisted in the investigation.
https://torrentfreak.com/can-kickasstorrents-make-a-comeback-160721/the strangest part of this is using Coinbase as bitcoin wallet which i don't really get. WHY

I don`t see anything strange in this.
Internet piracy is illegal and and Coinbase is helping the authorities in their investigation.
Bitcoin being anonymous is one thing,but when it comes to breaking the law,bitcoin wallet platforms should
help the police. This is normal.
after you worked a lot(maybe years) to make a software/movie, etc , i don't think you would like to see your hard work all of the internet for free. it's a huge work and only those who are staying/speculating and making nothing can agree with the piracy.