So regarding this, lets imagine we create a cryptocurrency that is based on rl crypto.
1. you can not make the value of it similar to the in-game resources, as it is not based on any product nor is it useful. There has to be demand for it. that is why the market prices fluctuate.
2. IRL crypto is currently much like a real currency. many markets/platforms use it. it can be exchanged into rl money. There was demand for it, because it was advertised as a safer alternative. In this case however, there is no possible way to make crypto safer and not completely destroy game mechanics whilst doing so.
3. More importantly, its pyramidal nature would let large alliances, like Rose or t$ create enormous fall in the value and practically steal money.
Its a bad bad bad idea