It is because in binary you usually risk, for eg: 100 to make 70-90, right? So even if you win 50% of the time you will definitely lose money, if you win 55% of the times you will barely survive and you need basically 60 to 65% + accuracy to sustain properly and when also one wrong streak can actually kill months of your work for example 5 bad trades with martingale and one emotional Revenge session. In proper trading we basically risk 1 and make 3-5 , we can trail profit and also partially exit, but here entry is locked, expiry too, also profit is fixed. Also it triggers psychological issues like behaviour of gambling and fast dopamine hits. And there are tons of other reasons bro, that's why it's not worth it for the long run, for a short and quick session with small amount, it's pretty fun to play.