It seems to me that, all other things being equal, an untrained person will have much more chances in trading than in gambling. All the same, the casino is designed in such a way that it would always be in the black, your mathematical expectation will always be negative. But in trading, everything depends on you. And a beginner can be guided at least by news analysis or by the trend itself, which may well help him stay afloat for a while, but over time, without knowledge and experience, he will undoubtedly fail.
Impossible that he wont really be getting any experience and knowledge over time because such engagement will definitely giving you the idea gradually on how this market works this is why its hard to
believe on what you are saying.
Mistakes are common but overtime we would really be correcting those as we do go ahead because no professional hadn't start on being a newbie and we do all pass on this kind of state or situation.
Futures I do considered a bit on the gambling side but if you do know at least or a bit good on trading then you would really have some advantage over this but not always a guarantee.
Leverage/Futures are knowns as capital blowners.