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Is there any downside to using temporary credit card numbers with subscription services?
If you've agreed to pay the money, then you owe them whether they have a valid credit card number of yours or not. If they want to report your debt to a collections agency and/or credit bureau, they can. Which would suck for you. It may not be that likely over $9.99 or whatever, but my point is that it's still a small risk even with a temporary card number.