It's almost impossible to report all these scams as quickly as they pop up, and their potential victims are not really on this forum nor would they be really interested in learning about Bitcoin. The scammers simply combine a novel idea and a promise of making double your money with zero effort and let greed do the rest.
The best way to curb this scams is people becoming more alert when on the internet, take everything as a scam until proven otherwise, this way you approach any offer with a certain level of skepticism and are less likely to fall blindly for cheap scam attempts.
I agree with you, the people that falls victim of such are not here eventually reading scam accusations. Newbies keeps been scammed all days. Could remember when was still participating in airdrop where telegram channel warns out no one should pay to get airdrop and such act are fraudsters.
This same happened at op post, never pay to receive giveaway.