If all email providers charged for email, spammers will hack accounts to sends spam or they will use stolen credit card numbers to create fake accounts. Hell, they could probably even set up a charity for themselves under this specific case and have all the money go right back to them. But since they will most likely always be free-to-use email providers, spammers will just always use those, making the pay-per-email ones just money grabs for the think-in-the-box'ers. I'm not really convinced that 100% of the money will go directly to charity anyways.
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If all email providers charged for email, spammers will hack accounts to sends spam or they will use stolen credit card numbers to create fake accounts. Hell, they could probably even set up a charity for themselves under this specific case and have all the money go right back to them. But since they will most likely always be free-to-use email providers, spammers will just always use those, making the pay-per-email ones just money grabs for the think-in-the-box'ers. I'm not really convinced that 100% of the money will go directly to charity anyways.