It makes a lot more sense for public transit, though: they’re located in dense cities with many vendors nearby. Same can’t be said of a car charging network.
However if we ignore the problem with money laundering, prepaid cards can still be a nice option for many people. If you are about to leave for a road trip you just make sure your card has enough money on it to cover the trip, then you don’t have to worry about your phone dying or your bank card failing etc. which can get you stranded.
This was also an issue with mobile phone payments, it was solved then, it can be solved today.