Er, no, it means a thing is centralising (which is observably the case). The word doesn't just refer to the limit case of a single entity. And we have in fact

Er, no, it means a thing is centralising (which is observably the case). The word doesn't just refer to the limit case of a single entity. And we have in fact had the single entity case, when GHash went over 51% (and had successfully conducted a 49% attack already), as you already know.