The first superhero movie ever was based on a DC character, who years later caused huge legal issues with Marvel, and was eventually renamed.
It was shared in virtually every possible format imaginable except one: movies. That's because someone else took his place. Captain Marvel was another hero that made his debut in "Whiz Comics #2 ...
My longstanding, oft-stated preference for DC movies over Marvel movies is best summed up ... That’s a heavy intro to a review of Shazam! — a movie advertised as much, much lighter fare.