Your post advocates a
( ) technical (X) legislative ( ) market-based ( ) vigilante
approach to fighting spam. Your idea will not work. Here is why it won't work. (One or more of the following may apply to your particular idea.)
(X) No one will be able to find the guy or collect the money (X) Requires too much cooperation from spammers (X) Requires immediate total cooperation from everybody at once
Specifically, your plan fails to account for
(X) Lack of centrally controlling authority for email (X) Open relays in foreign countries (X) Ease of searching tiny alphanumeric address space of all email addresses (X) Asshats (X) Jurisdictional problems (X) Extreme profitability of spam (X) Technically illiterate politicians (X) Extreme stupidity on the part of people who do business with spammers (X) Dishonesty on the part of spammers themselves
and the following philosophical objections may also apply:
(X) Ideas similar to yours are easy to come up with, yet none have ever been shown practical
Furthermore, this is what I think about you:
(X) Sorry dude, but I don't think it would work.
That's the key difference with phones - phone numbers and call are (quasi-)centrally controlled - by your network provider. A simple legislative solution is just "user gets $10 discount on their phone bill for each spam call" and watch the problem solve itself...
Where does the $10 come from? (Who pays it? Who collects it?) Also, you just invoked a Cobra Effect. https://en.wikipedia.org/wiki/Cobra_effect
In India we have a national DND (Do Not Disturb) registry that anyone can signup for and choose whether to receive marketing communications or not, and what categories therein. The regulator has made the operators enforce the reporting mechanism along with penalties (monetary and otherwise) on the marketers for violations. But still, there are cases where a marketer may claim that the person receiving the call/SMS opted for it and signed up or had some transactional relationship with the company.
My only guess is that you misunderstand what is being proposed. The spammer is not part of the transaction.
The phone network is controlled centrally. Government can force handling spam by phone companies, the same way they can force them to give police call logs etc for the purpose of collecting evidence.
Further more, Robocalls usually are of a more local nature (not international). Government may instruct Police to investigate origins of Robocalls and enforce sanctions. A formal complaint process could be made , where any end user may file a complaint, Providing proof is trivial. Both for the act, and origin (Robocalls are advertising a specific product from a specific company.) A law could be made which mandates a speedy process for filing relevant lawsuites with small claims court, if found guilty the offending party will be levied a large fine.
This is from the top of my head. It probably contains many flaws. But it certainly doesn't seem impossible to combat Robocalls.
Honestly, I want disposable phone numbers (which are still compatible with public networks) something akin to email aliases. So if one number gets a lot of spam calls, I can just route it to /dev/null.
We need a complete array of legislative + technological solutions.