New categorization might be good, but what exactly distinguishes a Ponzi-type game from other gambling?
There is one thing that did it.
Ponzi owners say to users that is "120%" "LEGIT" "STABLE" and other shit. They do not say - you MIGHT lost lost your money.
When you place a bet @casino - you know what you are doing and you know before you place a bet that you can be a looser or a winner

that is main different between Ponzi and other gambling projects.