Indeed, as a professor who studies these systems for a living I also had to think. Will this scale? Big step forward if we get something like this finally to 1 million people. Who owns the server infrastructure? How are these miners paid? The usual token-based incentive? Where do I buy these with real Euros or Dollars?

Incentive alignment is key. We known since Bittorrent tit-for-tat that creating a micro-economy is a hard problem. I hope they get some sort of token and micro-economy going, but this is a known hard problem.