This whole thing is too passenger-friendly and so not in DL’s favor. In theory any DL flight could be sold out with 100+ sold seats and not one passenger shows up for the flight.

All passengers still receive a 100% voucher credit with no penalty and DL loses out on the 10+ passengers who would have paid good money for the flight but it was sold out so they were forced to travel on AA.

Pre-Covid DL would get to keep $200 per no-show plus get to keep all of the miles used for no-show award tickets.

There is zero incentive for no-show passengers to cancel in advance. This is unsustainable and cannot last.