Everyone should be very careful in this forum as a lot of people here are just actively planning on scamming other people, and a lot of people have already been scammed
Scam comes in different ways, but most people are victims of scams for two major reasons: 1. Greed and 2. Gullibility. Remove these two, and you will hardly be scammed.
Just to top up on this points raised, once it comes to an opportunity, there is nothing that should be made hidden in the whole package, this is strictly business, they should always try to make known to the public what they offer, whom they needed and the terms and conditions for their services, then those eligible can apply, but when its all about secret stuff, avoiding others to know what they intend to offer, shows in transparencies and that alone is a red flag and destruction about to come, there could be more hidden agenda than that when you privately contacted these people for their trickish offers, everything is expected to be done on a plain and mutual transparent atmosphere.