Bit of a weird poll to mix up marketing methods with products? Not really sure what the poll's outcome will be.
You can own an ecommerce product, and have 100 affiliates who all use spam to rank sites that sell your product. You're making most your money with SEO spam, but do you answer ecommerce on the poll?
I'd say that is ecommerce.
SEO spam income is for people who have spam sites that rank and bring them money through whatever means (lead selling, adsense, affiliate, whatever) but that don't handle ecommerce directly and that don't have real informational sites (which can both use spam techniques). When I wrote SEO spam I was thinking adsense farms, porn sites with no real content of their own, most pay day loan sites that just sell leads, etc.
I know it is a bit of a strange mix up...