He has legal problems in the US maybe he tries to leverage his real or fake information to settle it. And he is in the cryptocurrency business, so
his potential clients are people who are libertarians, who buy cryptocurrencies. This is a group of paranoid conspiracy theorists (generally speaking not every single one of them) and they believe that
the Clintons had Seth Rich murdered. It makes him look important like he knows stuff.
But why take the case Seth Rich for it. Outside US nobody knows about it. But of cause I am not 100% shure.