But... there are infinite precious metals in the universe and bacteria can make it from their anus..

Excellent point: Why are bacteria not being used to mine bitcoins?
well, in the reality, you can supply a digital clock with potatoes ... so, yes, you can mine bitcoins with ... a thousand potatos for UPS.
i prefer solar panel ... more reliable over 25 years.

In the future we will be sucking our entire sun energy to mine a tiny fraction of the already existing 21 mill of bitcoins, while a fleet of mining space ships will be dumping tons of fresh infinite precious metals in the market.