how it is a scam if they are not requesting any money, but they are offering everything?
i can't see as a scam sincerely
It's probably more of a publicity stunt or attention seeking by the fantasist who created it than a traditional scam, but I think they might have charged people a fee to review their applications and they're selling merchandise etc but regardless of their motives one thing is for sure it's not going to happen as there's not the money or technology for it.
Well, we don't know that for sure as of now. It's what will happen over the span of the next 10 years that will dictate whether this mission will become a reality or a complete fail.