Great question. I just looked over the Portland providers ads and was not impressed. With the exception of a few legitimate providers who have posted, some of who I know, many of the ads look like scams. Phone prefix codes from who knows where, pics of young little hotties who are definitely not providers. It reminds me of backpage. Like walking through a mine field.
Sending the best of luck to the legit Portland providers trying this site out. I'm not coming back however.