@cjrando Like Cthulhu. (Or Tolkien.)

But YouTuber Austin McConnell is doing that with public domain superheroes. He's calling it his own cinematic universe, even if it's not all actually cinematic (I think the big thing is an upcoming book, but he's using "cinematic universe" as a short-hand term to explain what he's doing.) Interesting stuff. No idea how it's going to go, but several fun videos have come from him putting the idea together in plain sight, though.