Hub is borrowed from logistics and technology, where it describes a node that connects many routes. In this name it frames the site as the place miners go to buy, sell, compare and learn. Bitcoin and mining define the subject without ambiguity. German readers know hub from airports, start-up centres and parcel networks, so the term needs no translation. With the .de ending, the address speaks to the German market, where questions of electricity supply, heat recovery and permits are settled locally.
The domain sits in the mining category and the Bitcoin Mining DACH collection. Its connective character suits platforms as much as single operators: a used-hardware marketplace, a comparison and review site for mining equipment, a forum and knowledge base for small miners using heat for buildings, or a coordination service that matches sites with spare electricity to companies that need hosting.