Anons already have cash
No bank runs
For the Utopian crypto-monetary system to work, every person has to have an account, and global access to the Master book of raw data (no middlemen).
It takes a lot of energy to maintain that network 24/7/365
That bill has to be paid somehow through fees, taxes, interest, inflation, etc.
Solar is "free"
Solar networks aren't free; they have to be built, maintained, and upgraded.