On Ebay I can find around a dozen people just in my local area trying to sell their mining rigs with stuff like 5 x 3070 cards: https://i.imgur.com/nI8GYsG.png

Graphics cards were definitely bought in stupid amounts for this purpose.

Maybe not for Bitcoin anymore, since there is specialized hardware now, but it doesn't really matter which proof-of-watts-per-hour cryptocurrency we're talking about. They're all shit and the planet would be better off without them.

Without bitcoin, there wouldn't be cryptocurrencies mined with GPUs.