In our place they open a company who will accept investments which they guaranteed 400% interest for 1 month. I have found out that they do crypto trading. Is this usual to identify them as a scam?
It is just a ponzi scheme, a few people that I known came to my house offering their marketing plan. Worse, they used the name of Bitcoin in it. They were so excited about sharing the opportunity they found, they even calculate my earnings of $100K in just a year for a $1k investment. I just keep quiet and rejected their offer. There is no need to argue because I feel they were engulfed by the greed triggered by that investment scam.
I agree with OP, traders won't bother teaching people unless they get more on it than trading on the market. I always suspect that those who pretend to be a trading guru and ask for payment are losers in trading. If they were successful then there is no need for them to get paid while sharing their knowledge.