This is cool, it’s also not the most accurate.

The US DOT requires airlines to submit reports on mishandled luggage.

One such is available here; https://www.transportation.gov/sites/dot.gov/files/2024-05/M... Edit: see page 39

Point to point carriers such as Allegiant and Spirit typically do much better than carriers that operate a connection like Delta and United.

Since they are souring their data from people on social media I suspect the chance that someone complains about missing a bag varies more than the amount of missing bags.