It’s not that NV spends a lot to get market share. It’s that for over a decade NV provided the actual tools to build all this and AMD didn’t and then when they finally did they fumbled it, then when it finally paid off big for Nvidia they had to start from scratch again.
People might not like it but Nvidia’s dominance is completely deserved from the actions, or should I say inactions of the now disbanded OpenCL crowd