In order to "clear the tab", we have to make a payment to reset the balance. While I get what you are saying, I'd like to leave it up to individual user to make that decision.
So when you reach the minimal pay-out level and are rewarded for it, you are free to send the little donation to a charity of your choice.
Cashing out 10 bucks one day is still better than not cashing out anything at all.
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