The way RWE actually works is like cell phone plans. Users have to sign up for a 1-year contract. This gets you an ID token which the charging stations recognize when you plug into the charger. Then there's an EUR 0.30/Kwh charge, which is billed periodically. That's the usual way the system is used.
The Share and Charge system [3] doesn't use Etherium as a currency. They use Euros. Payments are made using SEPA, PayPal, and Sofortüberweisung (which is sort of like Venmo.) They mention that they're using a blockchain, but don't mention Etherium at all. Share and Charge is a third-party payment system for electric charging points. They try to sign up charging point operators to accept their payment system.
So the headline is somewhat deceptive.
[1] https://www.rwe-mobility.com/web/cms/en/1178726/private-cust... [2] https://www.rwe-mobility.com/web/cms/en/1232368/products-ser... [3] https://shareandcharge.com/en/