I think its the case that the vast majority of mail carried by USPS is unsolicited junk, but it pays the bills to stop at every house in the country every day.

I think its the case that the vast majority of mail carried by USPS is unsolicited junk, but it pays the bills to stop at every house in the country every day. Wouldn't be surprised if the plurality of phone call revenue is spammers, and then there is no way to solve the problem but to make fines (to the provider) higher than the revenue.