Not the Marvel Cinematic Universe of films.
The MCU overwrote the main Marvel Universe because Marvel didn’t have the rights to most of their characters, used what was left of the roster and made that the main universe, publicized smaller characters for a profit, improvised new ones, and cobbled together all the existing franchises in Marvel history in an attempt to remake all the characters again.
At this point, I don’t know anymore what is the true Marvel universe because of the MCU tarnishing the goodwill of the comic books.
And why go through so much trouble to make a movie when you’re a comic book publisher?
MCU has always been 199999, and 616 has always been the primary comic book universe.
Confusingly, the in-universe characters in the MCU have referred to the MCU as 616 because Kevin Feige decided that the MCU was 616. One was Mysterio in Far From Home, who turned out to be full of shit, and the other was Christine Palmer from 838 (Illuminati) in Multiverse of Madness. So from the 838 Universe, 199999 looks like 616, but from our universe, 616 is still the primary comic book universe.
Yeah I never said it wasn’t 199999, just that I couldn’t remember the number. Imagine claiming your own universe is 616 right before doing a bunch of Multiverse stuff, where you could include the actual 616…