Thanks op for this reminder because I believe there may be ones whom may have not heard nor seen this kind of method in term of scamming. Don't let greed push you into what you don't know, just be careful in learning and using the right platform.
Scams happen everywhere and this is just part of the battles we face for been trying to use a new tech and people that fall victims the most are the ignorant ones who invest into coins without investing into knowledge and security. The funny thing about crypto scams is that people that indulge in it are just regular people like us but they happen to be knowledgeable than others, they look beyond what others do or some complexity we don't often look at and they hide behind that to tie advantage of people, that's what scammers are doing here in crypto.
Furthermore, some people are blind by greed just as you mentioned, they love to make money where they didnt put anything, even conservation of energy stated that you can't create energy without not using energy but scam victims want to create money where they don't put any money or sometimes they want to create more than what they put. How can someone be expecting 300% interest in 3 days with your small change, that's ridiculous.