You are probably right but this doesn't stop them going to a crypto world trusted person or group, getting them to sign an NDA and giving them the details so that they can vouch that there is something real behind this.
The BTC should also be in escrow.
Just saying - this could be a really good opportunity, the concept checks out fine and I would like to buy in but I would really need more than this.
Who would you trust enough in crypto world to sign an NDA and really not tell anyone? I'm just going by the old adage. Don't invest more than you can afford to lose. This looks like a decent risk to take imo.