emm, Yes?
And if it's not an Obvious yes to you then you probably lost touch with reality.
Try to run a ponzi in real life and see how fast you land in jail, that is because the people in charge of printing the money will hang you from from the nuts
So if you find a ponzi in USD (or Euro, etc) that hasn't been taken down yet, will you join it and "invest" your life saving in it?
If your answer is yes, then the problem is clearly not about bitcoin but also USD, Euro, GBP, CNY, JPY, etc.
If your answer is no, then why did you join a ponzi in BTC?