Missing Movies From List of Franchises?

I've noticed, over the years, that a number of franchises are missing from here: https://www.boxofficemojo.com/franchise/ Here are a few examples, listed in alphabetical order: 101 Dalmatians 48 Hrs Anchorman Bad Santa Beverly Hills Chihuahua Blue Crush Buddies (dogs) Deep Blue Sea Emperor's New Groove Gnomeo & Juliet Happily N'Ever After Happy Feet Hitman Hollow Man Horrible Bosses Hunchback of Notre Dame In The Name Of The King Little Mermaid Puss In Boots R.I.P.D. Revenge of the Nerds Sex and the City Short Circuit Smokin' Aces Surf's Up Thin Man Tinkerbell Any ideas why they're missing? Many thanks in advance!