A social media post campaign might be a good start to exposed this scam exchange. We just need to make it trend so that the public can see what’s the cause.
Still one will need a lot of FREE time to invest. 1st you need to check every users in the forum and anywhere else who were victim of 1xbit. This will take you a long time. Once you have xxx number of users then launch a social campaign, maybe a Facebook and twitter page. Give efforts to viral a hashtag together to make awareness. It's just a lot of work to do and patience is needed too. It sounds impossible but it is doable.
Finding all the victims and collecting their contact could be a good start. Question is who will take this project and give his free time for this non-profit initiative?