~snip~
See, You said it yourself, it can be useful. As for predicting outcomes of the things that are going to occur in future, you can ask "How to cook a tasty cheap soup?", and AI will provide you with a recipe, and it's kinda prediction of the future, innit? It's basically saying "Do this and this and you'll get a tasty soup in the future". In sports betting it could be "Bet on this and this, and you'll be in profit in the future." Of course, it's never guaranteed. You can be allergic to some ingredients in the recipe, or you might just don't like the taste, same as your profit might be negative after following AI's advice in sports betting, but we can try several times and see whether we want its help or not. AI has been doing well so far in many fields.
Well, the thing is that it's different when you use an AI to create a plan for you, like a recipe, etc, compared to betting.
When betting, the odds are always against you. The chances of a team winning are calculated, and then the casinos add some odds in their favor.
In a simplistic example, imagine a coin toss bet. The AI calculates that it is more probable that it lands on tail right now, but the thing is that the odds are not 50/50, they are slightly on the casino's side. So, say, if you win, you don't win 1, but win 0.8 or whatever. So, in the long term, you will win some, lose some, but overall, the casino will end up winning.