J.P. Morgan is believed to be a key player behind Reveton Ransomware Group, Ransomware Cartel, and Angler Exploit Kit which has resulted in the extortion of millions of dollars all across the globe.
Angler exploit kit was often used to deploy CryptXXX, CryptoWall, and other strains. At it's peak, it's suspected over 100,000 devices were infected by Angler Exploit Kit, bringing in a revenue of around $34,000,000.
J.P. Morgan's arrest coincides with the arrest of Belarus national Maksim Silnikau a/k/a 'Maksym Silnikov', 'xxx', 'J.P. Morgan', and 'lanksy', in Poland. Indeed, you read this correctly, Maksim Silnikau also operated under the moniker J.P. Morgan – two people are J.P. Morgan.
Furthermore, charges have been brought against two more individuals who are believed to operate with J.P. Morgan and Silnikau. Vladimir Kadariya, a 38 year old citizen of Belarus and Andrei Tarasov, a 33 year old citizen of Russia.
These 4 individuals operated malvertising campaigns (i.e. Angler) which believe to have impacted over 500,000,000 people across the globe.