I'll tell you my theory: it is (or at least, was, for a long time) gaming. There are so many gamers, and they bought expensive hardware, and replaced it frequen

I'll tell you my theory: it is (or at least, was, for a long time) gaming. There are so many gamers, and they bought expensive hardware, and replaced it frequently. That made developing processors and video cards pretty lucrative. Hence GPU-based neural nets and Bitcoin miners.