Obviously, OpenAI could have had copyright restrictions in place from the get-go with this, but instead made an intentional decision to allow people to generate everything ranging from Spongebob videos to Michael Jackson videos to South Park videos.
Today, Sora users on reddit are pretty much beside themselves because of newly enabled content restrictions. They are (apparently) no longer able to generate these types of videos and see no use for the service without that ability!
To me it raises two questions:
1) Was the initial "free for all" a marketing ploy?
2) Is it the case that people find these video generators a lot less interesting when they have to come up with original ideas for the videos and cannot use copyright characters, etc?