There is a very serious piece of data that may constitute a solid starting point, if put in relation with other elements of information gathered elsewhere : find detailed information about the company which was hosting the website. In order not to influence you, I won't tell more about this for now, but if you manage to find which company (which might be part of a larger group, so prepare to go deep in the level of details, and do not stop at the highest level), and the details of how they make business, that would be quite helpful.