While France is the big favorite in its game vs Australia, there is no such thing as free money and thinking that is a 100% winning bet. Surprises always happen at world cups and not saying that Australia will win, but always be cautious also.
this is the world cup which is held 4 years so it's not as easy as how to play in the league, everyone will work hard for that struggle because it brings the name of the country too, look at the previous lesson where south korea beat germany, so nothing is impossible in this world cup because all deserves to win, so of course betting on the world cup is very difficult to guess
I think group phase (at least the first 2 games) are quite predictable, maybe the last round may be surprising - there will be teams for which tournament is over etc, so we may expect that some teams will not play at 100%. But then yes, we may have some surprising results.
I only do not know why we cannot have all the games and only a selection - 9 games only? As I see most of them has a clear favorite, only USA-Wales has almost equal 1/3 odds for each option.