Crypto world is plenty of scammers, wich does offer you something very cheap or new, the thing is crypto did atracted a lot bad people wich were into fiat scam projects, now they are more safe at crypto world. There is no a valid concept why they scam, besides the easy money maker, those people usually looking for fast and easy money, and newbies usually fall in the traps, i believe they scam because the opportunity shows up to them and blind people invest and believe its possible to earn money without work.