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.
as long as there is a chance they will take it , no matter how good their attitude it was , once they are feel desperate they will do anything whatever the risk and ignore every common sense things that actually they used everyday.
and especially when it is talking about how online business run based on trust , people sometimes act careless.