When the scammer tells you...
1) to give him your wallet id and password
2) to use a blockchain wallet he created for you.
3) to fund your wallet after you changed your password
4) that you will get 5000% back in a day (high percentual return in a short period of time)
Any more??? let's discuss!!!!
P.S. by the way, I have found a very good platform called gebepay and I have used it a couple of times and found it pretty useful and safe to buy products or services with my ETH, anyway have a look!
There many traits from where people can identify that a project is a scam. You have mentioned many of them. We should always read the whitepaper carefully. It should include all the important details of the project. Then also read about the developing team and about their qualification and experience. If it is a scam, we will not find much information. The idea should also be unique and new.