I guess what they are trying to do is create a fixed way of how people earn money at first but will cheat them at the end since gaining money from nowhere really seems like impossible. Money within the Cryptocurrency Industry is not created instantly and things take time. If what they are doing is scrutinize, people will see what is happening wrong since it will be most likely a scam and people should think twice before considering it.
These are the most common ways that pyramiding scams are doing to get money from people. Of course, a scam will not work if they don't have any proof of payment so people will believe them. But as long as we spot these patterns of earning money through invites, or through people putting their own money for your sake, leave the scam behind and report it. Another thing is when they are promising big gains that are too good to be true, that's a red flag already.
On the other hand, it is also true that money in crypto could be easily earned, but there are no legit projects that front the phrase "You will earn big here" or anything related to that. They are backed with actions not by these words so be careful.