Their target is newbies. Those who have no idea about such scams. These scammers take everything from them as soon as they start their journey in crypto. Those who are old know that these are scams, but those who are new to the crypto market believe in such promotions and send money to scammers. Since libra is Facebook's currency, it's easy to believe here for newbie. Because they think from the beginning how their fund will grow fast.
^Exactly, newbies mostly don't know nothing about the project. The fact that is coming from Facebook is enough to make them support the project. They don't know how to research properly so it is very likely that they will fall for this. Hence, it is good to report such projects whenever it comes up and do the part of research and raise up flags for them and alert the people as much as possible.