What happens when the CC fails? What happens when the CC fails and the customer is non-responsive? Ultimately Colin has to make a call of whether he deletes the files or not after some point of non-communication from the customer.
He will eventually have to wipe my data. However, as it is quite valuable to me, I want this to happen after actual attempts to contact me, including many emails and actual phonecalls. And at the very least no earlier than many months after payments stop. I'm okay with paying more for the service to get this.
So, why doesn't anyone set up a payment service dedicated to topping up tarsnap accounts? If this is something people want, and colin doesn't care to implement it -- just pay someone else 1.5 the price with the added (mutual) guarantee that you won't run out of funds (possibly with a max, and/or complicated rules for when payment should cease) ?
Sounds like easy money all around, and colin won't have to deal with the support fallout (nor get paid to deal with it, which is ok).