There are applications where the point is 3d graphics. I don't object to letting them use my gpu if they ask nicely. There are other applications -- really the vast majority of them -- where 3d graphics is completely beside the point, and has nothing to do with the reason I'm on your website. That is my concern: that that second class, being the vast majority, will say, "hey, I have access to all this compute power, why don't I just throw some of it at this needless animation that I think looks cool, or at this neural network, or at this cryptominer". Past experience suggests that this is a reasonable concern.
