I may be naive but I do believe that they are south American would be a reasonably easy check as south American Spanish is as different from normal Spanish as Glaswegian is from English
I think people's concerns with them fall into to two categories,
they are all coming from geographically the same part of the world, work from the same locations and seem to have centrally managed profiles. Now that sounds to me like being controlled and as such makes a successful conviction of the punter for visiting a known controlled girl a hell of a lot more likley
Second category and probably the bigger off put is the fact that these girls rotate profiles so you never know if the feed back relates to the current "owner" of the profile. That coupled with the fact that the photos bar may be one are all photo shopped or over 5 years old. The girls are very unreliable with services offered vs delivered and finally thier grasp of the English can't normally be described at best as tenuous.
All of this put together means I would rather spend my funds on a more reliable whore