Without having to pay royalties to Warner Music Group. A U.S. district court judge in Los Angeles has ruled their copyright on the song is invalid. If the ruling stands, the song will become public domain and Applebee's servers everywhere no longer have to sing altered versions.
That's a shame. There are few things as repugnant as the servers gathering around a table to sing to somebody, while the rest of the patrons wait to be served and the food that's ready in the kitchen grows cold.