Except the unfortunate gamers that go for these used mining cards for an upgrade with no warranty and I have seen too many posts about problems with used cards that have been sold by miners.
The bottom line is that miners have no business in PC gaming hardware to begin with much less all of the harm that they are bringing to our hobby.
What if crypto doesn't crash for years? How will all of these gamers that need an upgrade going to be able to get a card new or used?
This is not only going to affect PC gaming today but it will affect PC gaming in the future as well because most gamers simply can't afford the ridiculously priced GPUs from scalpers and may just leave PC gaming which will have a domino effect with Developers neglecting PC game versions because there will be less money in it for them.
The same could be said of any used card, mining or otherwise. You aren't making an argument against mined on cards, you are making an argument against used in general. There are far more posts of people having issues with non-mined on cards than mined on cards. Mind you, it's pretty easy to mitigate problems in either case by simply testing a card when you receive it and giving it a quick look over. The vast majority of GPU returns happen within the first two months. After that period, that probability of issues drastically drops. If you purchase used (including mined on cards) and properly test, the statistical chance of you running into an issue is the same between the two. Both mining cards and used cards can be treated poorly, although from my experience mining cards arrive in better shape typically than gaming cards. Some used gaming cards are in pretty terrible condition.
In addition, it is possible to get a used card (including a mined on one) with a warranty. ASUS, MSI, and EVGA all offer transferable warranty. Again, it's really the same consideration you'd have to make if you are buying used anyways.
The bottom line is that miners have no business in PC gaming hardware to begin with much less all of the harm that they are bringing to our hobby
What if crypto doesn't crash for years? How will all of these gamers that need an upgrade going to be able to get a card new or used?"
I'd like to point out that video cards are also used in medical imaging devices (among other industries). I have personally sold GTX 780 Tis to a hospital. The fact of the matter is, if crypto on GPUs is long term (and I'm not sure that it is) it is up to AMD and Nvidia to address that demand. You can't really fault them in the case of Covid-19 as the demand spike was very sudden and large but they would have to be complete fools to not increase production to meet the demand from a market that is increasing in size.
"This is not only going to affect PC gaming today but it will affect PC gaming in the future as well because most gamers simply can't afford the ridiculously priced GPUs from scalpers and may just leave PC gaming which will have a domino effect with Developers neglecting PC game versions because there will be less money in it for them."
This is true and ultimately it's a problem AMD, Nvidia, and potentially Intel have to face. Again though they would have to be crazy to simply let customers walk away.