And rational approach is minimize the amount of cars on the road. Contrary to cryptos, there are certain applications where cars don't have real alternatives - like deliveries to small shops and restaurants, or for tradesman.
Cryptocurrency is an alternative to centralized parties that abuse their monopoly positions as payment platforms while non-profit/government sectors are too inept to provide a public payment option.
Here's a case of PayPal closing the account of a user because they used it to fund servers to run TOR nodes: