Found this list of properties not on Disney+ that are also not available on any other streaming service:

Aladdin the Series

American Dragon: Jake Long

Cory in the House

Angels in the Outfield

Buzz Lightyear of Star Command series

Adventures in Babysitting

Splash

The Happiest Millionaire

Aladdin (2019)

The Lion King (2019)

Toy Story 4

Beauty and the Beast (2017)

Pirates of the Caribbean: Dead Men Tell No Tales

Into the Woods

Walt Disney's World of Color series

Oz the Great and Powerful

Condorman

Pepper Ann

Dave the Barbarian

My Date with the President's Daughter

Under Wraps

Jett Jackson: The Movie

Radio Rebel

H-E Double Hockey Sticks

Descendants 3

Life-Size

Model Behavior

Toothless

Tower of Terror

House of Mouse series

Air Bud movies

Classic Mickey/Donald/Goofy/Pluto shorts.

New Mickey Mouse Shorts.

The Muppet Show

Muppets Tonight

Aaron Stone

Dog with a Blog

Mighty Duck movies

Star Wars Ewok Movies

Original Star Wars Droid Tales

The Star Wars Holiday Special

The Original Clone Wars cartoon

Doug the Series