Waste of Electricity
Razer have cleverly invented a way to achieve massively distributed crypto-mining without the need to pay for hardware or a room to house it and -- almost certainly -- with lower (and less fungible) upkeep costs than the electricity bill to run such hardware. I am sure that kids, everywhere, will grab this with both hands because they already have a machine on which to run it and the "Silver points" they will "earn" will be free from their perspective -- no need to ask mummy and daddy for the credit card to pay for them. Parents who aren't aware of this will probably never notice.
But electricity is not free and perpetual motion is not a reality and so the environment will pay.
The sooner we ban wasteful "wealth creation" scams like crypto-coins, the better. You cannot create "wealth" out of a random-number-generator. What is being created is a vehicle for redistributing pre-existing wealth: the very definition of currency and there are less wasteful ways to implement a currency.
People perceive crypto-mining as profitable because they fundamentally misunderstand the nature of crypto-coins: they have no value until someone pays real money for them. People do pay for them and so this becomes a self-fulfilling prophecy and inventing new scams to trick others into paying the mining costs remains a dominant strategy. As long as this is true, the only way to stop the madness is an outright ban.
Ban them all.