Why isn’t warriors of the universe on the App Store

A quick search revealed Warriors of the Universe is a Google App. If you want the app on the Apple App Store, you'd need to reach out to Google. Apple doesn't own Google, so they can't just add their app to the App Store. Only Google could do that, if they were so inclined to do that.

This is a user to user forum, we can't add anything. You'll have to make your request by contacting Apple here.