Maybe at first, but I think the GP's idea is more generally to make sending spam not a viable way of making money. If end users never see spam and spam profits

Maybe at first, but I think the GP's idea is more generally to make sending spam not a viable way of making money. If end users never see spam and spam profits drop from 0.2% of email addresses or whatever they're at now to 0.000000000002% then other methods to make money will be used.