Any comparison between PPT and Bitconnect is absurd.  Bitconnect was a Ponzi, based on layered tiers of recruited new players with an ultimate collapse of the entire upside-down pyramid.  PPT simply continues the well known business finance mechanism known as receivables factoring...exactly the same thing banks do every day.  In this case, Populous makes the same functions peer to peer... more efficient, quicker and less expensive.  Each invoice contract is a stand alone transaction between invoice seller (who now can easily shop around) and buyer (who makes a reasonable profit on each contract). 

If you want to devise a Ponzi scam and attach it to crypto coin there are all sorts of ways to do it but Invoice factoring is not one of them.