Making profit day trading

So I hear from alot of people day trading is a scam and you can't make money. Lots of them talk about how the market movement is random so you are just as likely to gain or lose money. I even remember someone showing like an question that showed movement of stock on a daily basis is mostly based on white noise. Now hearing all that, my statistical side can't help but think. If trading really is random, 50/50 it goes up or down. But if we are in a bull market where instead of 50/50 it is 60/40. Aren't you statistically assured in turning a profit? And that if you just gamble on SPY every day that it will go up. And it is statistically more likely to go up, is that not assured profits? I'm curious to hear your thoughts about this? Maybe some points for this trail of thought? Some points against it? Thank you!