Update from comments: I'm SURE it's just a coincidence that training neural networks and mining cryptocurrencies are both applications that benefit from very large arrays of GPUs.

If *I* was a VC I'd be hiring complexity theory nerds to figure out what areas of research are promising once you have Yottaflops of numerical processing power available, then place bets on AMD, Nvidia, and (maybe) Intel going there and start seeding the field and hiring PR firms.