affiliate

提携する、提携させる、関係づける ◇L.ad＋filius(＝むすこ)

(verb-transitive) To adopt or accept as a member, subordinate associate, or branch: The HMO affiliated the clinics last year.
(verb-transitive) To associate (oneself) as a subordinate, subsidiary, employee, or member: affiliated herself with a new law firm.
(verb-transitive) To assign the origin of.
(verb-intransitive) To become closely connected or associated: The two unions voted to affiliate.
(noun) A person, organization, or establishment associated with another as a subordinate, subsidiary, or member: network affiliates.

It comes as no surprise that these "spammers," primarily affiliate marketing sites (the report makes no mention of the term affiliate marketing, by the way), create free-hosted sites and load them up with Google AdSense ads which provide them with revenue each time a user clicks them.