The good thing is that the United States wasn't part of it, and neither the forum nor the signature campaign was mentioned.
Continuing to read, I found:
The service was accessible under the domain eXch.cx and various other internet addresses. In addition to extensive data of over eight terabytes, the crypto assets Bitcoin, Ether, Litecoin, and Dash, currently valued at approximately €34 million
In the investigation, ZIT and BKA cooperated closely with the Dutch Tax Investigation Service (FIOD). ZIT and BKA assume that the findings gained in the proceedings will also contribute to the investigation of a large number of other cybercrimes.
So the coming days/weeks will tell. If they manage to catch more scammers, then eXch was storing the logs/IP/metadata.
I always assumed that the eXch account was being managed by multiple users, so it's likely that someone testified against them.