I am not a mod here... just adding some historical perspective for the newer members of the hobby.
Back in the day (10 -12 years ago), there weren't but a handful of providers on "the boards". When I joined ASPD (RIP), there were maybe 40 or 50 providers that were members. Reviews were of girls from wherever we could find them; Eros, Backpage, CL, dancers, UTR's that wanted more biz, etc.. - mostly Eros that I remember.
Most of the reviews were of gals who advertised elsewhere. Back then, we were more concerned about ripoffs, bait & switch, and upselling. We didn't have the luxury of choosing from hundreds locally right off this very board.
As the moderators aptly stated above, reviews of girls you found advertising elsewhere are not only welcome, but encouraged. The board is about information and your willingness to contribute information is appreciated by all the members.
Just a little FYI on the history of this Internet hobbying thing.