Something I was thinking of this morning, and perhaps there's something out there already that I'm not aware of.
Could a mobile game be developed that when played (theoretically by thousands or even millions of gamers worldwide) crypto was actually being mined in the background? The crypto could be bitcoin or something else depending on the developers. The gamers, in essence, are the mining pool, and they would share in any crypto profits just like mining pools currently do.
In theory, if you had enough gamers playing, the mining would be continuous, and the more the gamers that play the game(s), a larger portion of the block reward they could receive. The game would be the hook to get people into mining other than standard ways, or as another alternative than some of the current methods.
Perhaps the game isn't free, or maybe it is. Lots of options I would think since mobile gaming is such a huge market globally.
If this could be done correctly, I could see some great potential for the company/dev team behind it.