For all we know, they’re literally just passing massive checks in a circle to one another to say “yes, it says right here in our bank records that we spent a combined $100,000,000”, meanwhile only 25% actually goes into the production, and they pocket the rest.

That would be illegal and easily discovered

But you could pay $10M to hire another company to do the sound mixing. They might spend $500k to do the work. You might also be the owner of that company, and the money ends up back in your pocket…And that’s not embezzlement or a kickback, because that’s what it’s called when poor people do it