I don't disagree with you. There are other entities that solve the issue for taxi service, such as mytaxi, that pay by the rules - still "an extra layer of rent

I don't disagree with you. There are other entities that solve the issue for taxi service, such as mytaxi, that pay by the rules - still "an extra layer of rent seekers" though. But in general, even if technically possible, not a lot of businesses accept visa or mastercard - be it that the bank does not provide the service, or that they charge extra, it is not available. Luckily PSD2 will soon open the space to more players.