I don't care if you are legit, honest, fair, etc. A ponzi is a ponzi and I warn users for that by marking you red. They can always decide, based on posts, if they want to gamble or not. However, I might change the description added to certain Ponzi's.
I am sorry to say that your reasoning is wrong.
Ponzi is a scheme where investors get an illusion from the Ponzi operator that their investments are being used in proper business for their return, whereas in reality they are getting return from new investor's money. Hence this type of investment schemes are destined to fail by defrauding/scamming the investors. For example PBmining.com, Hashie.co, CryptoMine.io etc.
But, when a Ponzi declares itself that it is a Ponzi, then investors are well aware of the fact that the last person investing will not get paid. In this case, every investor knowingly takes the risk of probability that next investor will invest. Hence it gets categorized under gambling. Gambling is a service where people invest their money knowing that most will lose, but some will get high return depending on probabilistic calculation. For example Just-Dice.com, PrimeDice.com, BitDice.me etc.
So, if you believe gambling is scam, then declared ponzis are as well. In that case, you should leave -ve trust on Stunna, Dooglus etc. as well. Otherwise, you should not leave -ve trust on declared ponzis.
Of course, if they are cheating, i.e. not giving the promised return, then it is a different story, e.g. Dicebitco.in, dice.ninja etc.