Wouldn't it be possible to scan through addresses associated to a Ponzi and see how "far" they are from a fresh block mining address? That could be useful.
So, ponzi shows address 1Ponzi..... Scan that address and any address that has sent that address BTC (Yes I know, Could be a monster list) see how far it is away from fresh mined coins, Doesn't really prove anything as such but could be a nice indicator.
It's useless because if the creator doesn't send money to the ponzi address then we would get a list of people who "invested" in it. In this case the address is not bound to the owner so it would be hard to connect them.