I'm pretty sure I could predict Real Madrid vs. my local home town team with better than 69% accuracy, but that doesn't mean much
Long-term accuracy is 69%.
In this case, especially because it's an international, but heavily American audience.
I know Americans call it soccer, but that is I assume because of American football, a sport no other country seems to play, or care about.
The name soccer came from Britain, not the US. It was used to differentiate Association Football (soccer) from Rugby Football (rugby). Ireland, South Africa, Australia and New Zealand all still call the sport soccer. Even in England, it continued to be a popular name for the sport until the 1950s.
Correct, and most native English speakers are American. That doesn't even account for Canada or Australia where it has also traditionally been called soccer.
The fact that the "F" stands for "Football" in the name of an organization with a French name seems irrelevant.
Maybe you should get involved with Data Science, this field is all about playing with patterns (and hopefully finding a result), and even thinks like SVM's, random forests and genetic algorithms aren't really hard to grok and apply in that area.
There are some scientists involved with betting, but this field has really low profit margins IMHO. Personally, I view algorithmic trading as more interesting but YMMV.