Ive known several people who have gotten a call from LY a few days before the flight date. In which they were offered $200 as a DBV if they would switch their flights as the flight they were booked on was way overbooked.

They declined and asked for more in the way of compensation, they werent any more. Some lucked out in that they were able to get a Bump at the Airport, others found out that no vols were needed at the Airport as enough had taken the offer.