I read alot of financial news sites and they are always talking about the "death of the PC". Well bitcoin mining is a great example of something you can't do on your cute little iPad or iPhone.
That's just marketing by the producers of pads / smartphones.
They can sell you a newer faster and shinier one each 6 month. That doesn't work anymore with PCs.
So there is money to be made with spreading the death of the PC myth.