When compared to ponzi, gambling investment is lighter and we are also involved in the process directly, bankroll is also one of the best manivest gambling form. I personally also choose the investment because in the end there is no more games in our lives, all will become more responsible.
You can't compare bankroll investments with those Ponzi schemes because those schemes don't have any working model instead they just collect money from you and give it to others until they reach certain target amount deposit. Once they receive sufficient deposits, then they will close the site and come up with a new one to cheat people again. But in bankroll investments, you will make a profit in the long run for sure.