In long run.. We will all death.
Ponzi or not ALL OF OUR investments contains RISK. Even your money at your pocket contains thievery risk.
That is not a justification, nor is it an excuse, for supporting a fraudulent enterprise simply on the basis that you think you will make money before it collapses and leaves some other sucker holding the bag.
Gambling is the process of placing a wager on the outcome of an event based on evaluating the constants and variables which form the basis for the 'odds' a particular outcome will occur.
Investing in a scheme which is pretending to be a legitimate business is not gambling, it is investing in a scheme you believe to be legitimate because you are fraudulently being told it is legitimate by the promoters of the scheme.
That is a criminal act.