Big affiliate programs love spammers, they send them 1,000's of signups & then kill their account, keeping all the money to themselves. Then send you a lovely letter thanking you for turning the spammer in.
Get the fuck over it, criminalize it & it will move to another country where its not illegal.
It will never stop, spend the time you spend erasing it & reporting them, figuring out a way to stop it from getting in your box.