You are right about AI and sports predictions while AI is great at looking at numbers and past trends it struggles to correctly predict sports especially football because games are so unpredictable. AI can show you stats and team forms but it mostly misses key human factors and last minute changes that really affect match like main player getting injured team mood changing or bad referee call which AI can not truly understand.
This is why if you know sport well you will likely win more bets than you lose as knowledgeable person can consider things like player usual impact or team spirit which AI can not easily put into its calculations proving that human understanding still has edge in predicting sports outcomes.
You are right but still, those who know sports very well still lose money to gambling, there are many of them that went broke due to this same fact that they know about sport very well, the chances of winning isn't that high as we think because those who know about sport are more into sport bets than those who knows too less about sport.
Gambling is so much risky than just thinking that you can do so well because you know sport very well, it doesn't safe you from losing money to gamble because you can't still control your luck.
In fact it doesn't help a lot of people, know everything that's needed to be known about sport, you will still lag behind if you will get lucky or not, if its very easy many sport fans would have good stories to share, but its the other way around.