Dr. Eddies Wingman
Brighter than thousand_suns
But if you see it slowly Fifa is always helping the contest favorites... You can see it in Germany against Sweden and Brazil against Costa Rica.
Isn't this sort of disproved by the fact the referee cancelled a penalty to Brazil after using VAR? It would've been easy for him just to disregard VAR and stand by his initial decision.
In the more general sense, you're of course right that the big teams tend to get more decisions in their favor, but that's not unique to the World Cup. Countless are the times when a bottom-half club in any professional league feels robbed after losing to a top club.