I can see how the spamming part gets done, but how is he able to get payed without getting caught? If I see a spam link, and follow it until I get to a viagra s

I can see how the spamming part gets done, but how is he able to get payed without getting caught? If I see a spam link, and follow it until I get to a viagra selling website, I should be able to find either the spammer himself or someone who pays the spammer. How can he remain anonymous?