End of the day, its how many cards you sell, not what they are used for, if hardly anyones buying a Nvidia card, because everyones just buying AMDs up in their thousands for mining, its still going to drop their market share, and take away their dominance.
They're just missing out on a chance to crumble Nvidias market share, and rocket their own, they could end up on 70%, with Nvidia only on 30%, would do them wonders, devs would start using their stuff, and gamers would see that, pushing them to buy their card as well over Nvidias, so not just the miners buying them up, selling to miners, would help them massively.