Are nothing more than glorified message board "writers".
Anybody can be an "article" writer for them, and have their opinion just like here on this message board. Periodically if you do a search on them and find ads online that they are hiring "writers" for their articles.
Don't take my word for it.....look for yourself. There were ads online a while back for SA paying $20 an hour for article writers , and you do not have to leave your home, just like you do not have to leave your home to post right here on Yahoo.
One message board I was on a couple of years ago was an article writer for SA , and would tell us in advance what his article was going to be about, and take suggestions from posters on the Yahoo message board on things t write about.