The only person that can picture trading as a Ponzi or get rich quick scheme is someone who doesn't have a proper knowledge about cryptocurrency. Out there, a good number of people do not have concrete knowledge about Bitcoin, crypto, not even trading, they probably heard some misinformation from another inexperienced users and therefore get convinced by the small information they have got from that person. Trading is not very easy even from the start to when you become more experienced, although it also depends on the kind of trader the person is, some persons are leveraging while some are only spot traders and based on my own experience, spot trading is less of a risk compared to leveraging.