There are more of these types of models popping up. Offering this as a promotional tool in the costume of being 'helpful'. While it MAY be somewhat helpful to some, it's really a total benefit to the original site only. They get all the links, traffic, and content. A lot of them seem to 'claim' any content that is 'contributed'.
I have received a half dozen 'invites' to these kinds of things over the past 6 months or so. I normally will only need to read the small print, then delete.
