Maybe, maybe not. But the point isn't who the products were going to, it's just that the explosive growth was driven by an unusual, unpredictable customer base, and Nvidia should have disclosed that future growth would be affected if the cryptocurrency mining landscape (something far more volatile than the "regular" market for GPUs) were to change.
I agree that it seems dumb for the average investor not to know this, but this is just how this sort of thing works.
What's confusing to me is I swear I've read press releases from Nvidia that have clearly said "we're not adding new GPU production capacity because cryptocurrency miners are creating a demand bubble that's going to pop." Maybe from 2019 though, so maybe they were just waking up to it in 2018.
They got themselves in terrible in 2018 because they had a lot of excess inventory from over building when the crypto boom happened. I believe the stock dropped 20+% because of this.
I agree that it seems dumb for the average investor not to know this, but this is just how this sort of thing works.