No, it doesn't, because all Ponzi schemes will always unravel. Keeping quiet isn't going to help you.
What this does is it creates an incentive to not invest in a ponzi, period. Without this rule, it makes sense for me to invest into something that I think is a Ponzi, as long as I believe that I'll be able to cash out before it collapses.
Aren’t Ponzi schemes based on people being gullible? To protect gullible people from falling victim, we ask them to foresee in advance that they’ll fall into a Ponzi scheme…