I wonder if Epic truly understands what they are getting themselves into, and in case not, they should refer to the RIAA v. Napster case. "Napster was liable for contributory or vicarious copyright violations because it was allowing millions of users to download music for free." Now change "allowing millions of users to download music to free" to "allowing criminals to use crypto games to commit money laundering and other illegal activities." Epic, as the store hosting and selling these games, could be held liable as a facilitator.
"The present is a veil between anticipation and horror. Lift the veil... and madness may follow." source