That sucks for the people who lost out but equally do I have a great deal of sympathy for anyone mindless enough to fall for those advertised returns? Er, no. None whatsoever.
It's sad that Bitcoin is abused for these kind of obvious Ponzi schemes. There should be much better uses for BTC in this country, that could really empower people by opening up new business opportunities on the global market. However sadly I think that poorer people are especially susceptible to this kind of fraud, because they even clutch at straws to attain wealth. So if the promised return is high enough they will switch off all doubt. That even works when they know it's a Ponzi - in that case each individual investor assumes being smarter / faster than the crowd...
I also do not have much sympathy for that. In general, becoming wealthy requires hard work and/or good ideas. In my view it isn't even enjoyable to successfully attain wealth through such arbitrary "investment" schemes, because it feels like fake, is not productive, and does great damage to other people.
ya.ya.yo!