Citilink has hold interviews in Europe before, not that long ago, and jobs have come out of them.
I know it because a good friend of mine got a job with them after attending one of their European assessments.
The difference it's that my friend never went through FlyGosh. He applied directly.
You don't need FlyGosh to get an interview or to get the job.
They are purely a middle-man and believe me, they are more middle-man in their business than just the guy behind FlyGosh.
Are there jobs behind the FlyGosh offers? Yes (how many positions is another question).
Be aware that they keep taking groups of people for interview at $X a head and the interviews are held quite regularly.
You could end up paying for an interview/assessment only to be told that you have to pay for the job too.
Taking in consideration that their requirements are quite "flexible", cash become one of those break it or make it requirements.