How many people can really make their money with sports betting? If you follow the sport closely, you can find some value especially if it is like a smaller sport (no soccer or basketball or tennis). Don't just bet on statistics if you don't really follow the sport, I don't think, in the long end, that you will have a positive ROI. There are no safe bets, even betting on odds of 1.01 or 1.02 can still give you a loss!
Definitely it's a very small minority group of people, it's still gambling after all but you would have an edge if you knew a lot about the sport and the athletes, teams and coaches on it.
And i am guessing that someone somewhere has already build a good algorithm for winning with all the data we can get these days. But those kind of algorithms are never going to get shared as they would stop being an edge immediately.
I don't even understand how people make money by day trading as that seems a lot like sports gambling to me. There are no safe bets on day trading either, only probabilities.
I think day trading is even more riskier lol. I have always been interested in it as you can read a lot of stories online on how people made crazy amount of money with day trading and give out paid courses but if you really claim that you have the system to make consistent money, than why would you give it away?
In sports betting there are some value bets to be found, but you need to be on the lookout for them and you will not find them so easy.