Good one!
Are you serious?
The first of the fixes is publicly announced, it's called seeding which is another way to say rigging the draw so the big teams all find it easier to get to the latter rounds. Why? Money, what other possible reason could there be? None of these parasites actually has any interest in the game beyond how much it can make them. "They" are the people who skim money from football and put it in their pockets because they have friends who write stuff on paper that says they are entitled.
But we know all this.