CC fees add up, but/and electricity is cheaper than gas, so net-net, you gain. Also considering the convenience that you have zero worries and you will be able to charge hassle-free in any charging stations, I'd pay an extra €1 to not have any headaches, apps, phone charged, and any/all hoops by any apps.
Things like little kiddy rides and vending machines are able to take contactless payments (in the UK). I don't really see how this can be a valid arguement.
It varies by country. In NZ we pay about $0.5 each time using contactless/apple pay, but 0 when using chip+pin.
IMO websites and/or open API's are way to go - allows third parties to build integrations, automations and superapps that enable all sort of benefits for users.
The only opposition I've heard is "uwu but charge costs are lower so CC fees add up".