Spammers don’t tend to operate from first-world jurisdictions. (When they do, CAN-SPAM is decent about requiring working unsubscribe buttons). Spam is not a problem you can solve with regulation.
* Nigerian scam type spam
* ads/commercial spam
The first is already illegal, and yes, it's difficult to fight and comes from first world jurisdictions.
But the second is operated by well known companies, most of the time through well known service providers (Salesforce, Adobe...). And these companies do put a lot of personal information in their databases (what did you buy, did you click on a specific link, did you open a specific email, etc).
But the government probably wouldn't like that very much.