At the end of the day, the contract of carriage clauses are extremely broad and disadvantageous to the consumer. If the airline decides they want someone, or you, off the flight, there's actually very little recourse. Even the amount of time they can delay you without compensation during the day and with minimal compensation overnight is pretty absurd. That said, I'm not sure why they wouldn't just offer increasing compensation for those willing to bump to the next flight like usual. Four people will accept a few hundred to a thousand dollars to be bumped one flight.