They are doing the investigation after the ban because they are being sued. It is called a “cease and desist”. This is due process when someone is a victim of a crime.
The United States has a policy of innocent until proven guilty. Yet beyond that there is a US Federal Law which does not allow slander of a person. CCP did not prove the victim guilty yet went beyond that acceptable requirement to further violate law and commit slander in violation of US Federal law 28 U.S. Code § 4101.
It sucks yes, but it should serve as an education (a VERY VERY expensive education) to South Korean company Pearl Abyss that they simply can not have game masters violating law.
It is surprising to see that so much unchecked and obviously unsupervised activity is or was currently allowed to game masters whom were obviously not required to check the legal status of their activities.
It is amazing to me that an actual crime would make it all the way to publication on the EVE launcher itself, globally.