Because they have in their plans to swing and increase their social networks, and not develop their product or idea in any way. Their goal is to subscribe as many people as possible to their all social networks and then it is possible to sell them for a certain amount, well, and also the road to fool some money from gullible investors, so to speak, they kill two birds with one stone.
Scams are not decreasing, the bounty is created only for subscribers, often copying the site or whitepaper of old forgotten projects, hoping that they will not be revealed.