I banned both users and reverted their vandalism.

We also lost the "Bitcoin mixing" page. This was entirely created by one of the scammers, and notably appears to have been lifted from https://static.coinpaprika.com/storage/cdn/whitepapers/123.pdf

Since the author of the PDF is not anything remotely resembling the scam-posters, it seems reasonably certain the copy was not authorised, and is therefore copyright infringement.