I think I do not need to explain what I mean by ponzi crypto scam. Every week I see at least ten new ponzi scheme scams.
They often offer something like 100% interest per 24h (or something similar). They commonly run for quite a few weeks (or months sometimes) before "they go scam" publicly. The obvious idea how to exploit them is to invest something small at the first day, withdraw it as fast as possible and repeat just with the interests from the previous bet (and of course take some money away from every successful round).
Has anyone tried that?
yes, in my early journey in crypto and I'm happy to realized early that it as a mistake.
I learned a lot here actually, so it's alright to lose money at the start.
Have you been successful? \
No one is successful with this on the investor's side, unless you are the promoter, and your success will stay until the time you'll get arrested.
Is this kind of gambling popular/common. Has it name?
Very popular in the past, in fact there's still plenty to be seen here.
https://bitcointalk.org/index.php?board=207.0