I used the term "affiliate sites," a term that most of us would define as meaning e-commerce sites based on affiliate links. Affiliate sites are different from information sites that have affiliate links or other forms of advertising, just as a weekly shopper is different from a weekly newspaper that carries ads.
I agree that the lines between affiliate sites and information sites can get blurry, just as the lines between e-commerce sites and content sites in general can get blurry. There are many regional or local tourism sites, for example, that do an excellent job of combining useful travel information with booking links and paid ad listings. Are they e-commerce sites or information sites? I don't know. At this point, neither does Google. :-)