well, I think it is easy enough to do for them
they can add into bios a counter which count how many hours gpu is working of full speed
so once its value become like 2 month 24 hours of non stop activity of GPU- they will declare this card - a mining card and hence refuse to honor the warranty
sad.
Can't check the BIOS if the BIOS won't load! People will find away around this. What's happening is gamers are getting pissed off because graphics cards are going up in price because of demand. They cannot make enough to satisfy the market so they are trying to make it toxic for miners to buy their cards. This won't happen. As long as there is money to be made and coins are profitable there will be a huge demand for the cards.
it depends, you know. manufacturers or service centres might have special equipment which can read bios in different way then user can do.
or. they may install some different controller for that, which could count the load of GPU and timetable when this load is apply.
Actually we know that that games and mining creates different load for gpu