Refuse to pay the ransom? The credit card numbers are still worth a lot. You're only reducing their payoffs a little bit.
If anything, posting the ransom increases the chances that the FBI can track them (since it's hosted on a Tor server)
Re:Equifax hackers demand $2.6m ransom
by fapjacks on Saturday September 09, 2017 @10:40AM
(#15207274)
The FBI's Tor exploit works on visitors to a Tor hidden service, but doesn't work to identify operators of a Tor hidden service. However it is very easy to misconfigure a Tor hidden service and have it leak identifying information.
"If you give a mouse a cookie, he's going to ask for a glass of milk. When you give him the milk, he'll probably ask you for a straw. When he's finished, he'll ask you for a napkin."