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If Tesla is going to implement charging fees and standby fees, I feel they MUST enable some sort of messaging on the dash or through the app to let you know what is going on. For example, what the supercharging fee is (on new cars) and whether or not standby charges are in effect and, if so, how much has racked up. I don't think it's fair to show up for service one day and just have it sprung on you.
A recent blog post indicated that the relevant billing information would be readily available on screen and in MyTesla: "
Supercharger pricing information may be viewed on the 17” touchscreen and is summarized below.
Supercharging is simple and convenient—just plug in and charge up. Supercharging history is automatically populated in your website account showing the credits used or, if applicable, the amount billed. Tesla is committed to ensuring that Supercharger will never be a profit center."
Here is the support page for reference. Not sure if billing information will also eventually be available through an updated phone app. But that seems like a good idea too.