The examples given are all billion-dollar, decades old characters. The volume of material directly/indirectly referencing those characters in a random internet crawl will be fairly large. Most copyrighted works won't have that issue. If anything it means they only infringe on archetypal works and not the other 99.9%. If I write a story involving robots and spaceships (of which there are many, before and since Star Wars) DALL-E won't infringe me because it will be busy infringing on Star Wars.