I was pitched recently about Bitconnect. Everything I researched suggested it was probably what you are describing... no solid names or company for contact info, guaranteed returns specified, and altho no one could prove one way or another that the so-called "software profiting from the volatility of BTC" did or did not exist, most felt they were simply paying older investors with new money.
I've also seen a couple of Bitconnect articles here that were flagged. so I'm guessing the Steemit community has "ruled" against it? And also asking, is this one that you warn about? I actually haven't replied to the guy that got me looking at it yet, I just don't feel good after doing some cursory research on it.