"If anyone wants your ads, they can sign up for it, delivering it to anyone else should be punishable by law."

Let's say I am a Gray Actor, Company X, who sells great products but I want to make money on digital signups. I add this unchecked box to my order form: "By checking this box, you agree to be contacted by our partners with promotions." - can checking this box apply promotions to the mail address you entered on my shipping form? - can I sell the rights to send you mail promotions after you check this box? - how long can I send you promotions? - how hard can I make it for you to "unsubscribe" (phone, written by mail, difficult to navigate website)? - you demand proof from a partner that you did indeed check this box after I send you a promotion. What do I need to supply? - the original subscriber has moved (without my knowledge) and I send generic ads in their name to the new tenant at the old address. Am I still in compliance?

Even if you presuppose "sign up for ads" is the only way to get spam, there are a lot of protections that are still missing.