I'd like to hear from you about what i have found out.
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's called HYIP/Ponzi scheme so definitely it is a scam. Don't even bother to put even a penny otherwise you will just lose everything in the end.
Yes, I think that successful traders do their hard work and lots of ups and downs in their trading career so it doesn't makes any sense to just offer them to others to make profits. Maybe we can call them selfish, but we can't blame them because they have sort of 'perfected' their trading skills and will not bother to spill out their secret success.