I have to assume that he has some kind of moral code he lives by. I will, therefore, find it likely that he now sees BTC as something valuable to society (i.e. growing), so that is worth working for a company that makes/ mines BTC. It is possible, but I doubt it, that he has such a short-term and unethical intention as you suggest ("earn some money off the stupid crypto people as long as there is attention to it").