EXCERPT:
A Marvel producer has stated that the MCU is a giant version of one of the stories in the upcoming What If…? series. After the climactic events of Loki and with What If…? set to premiere on Disney+ next week, many fans have been wondering about the multi-verse angle in projects moving forward. However, it looks like Marvel has been dealing with the multiverse all along if they consider the MCU to be one of the many parallel worlds to the main comic book continuity.
In Marvel comics, there is one “prime universe” in which most of the canon comic-book stories take place. While many at Marvel prefer to just call it the “Marvel Universe” (as opposed to say the “Ultimates Universe”), it was dubbed Earth 616 in the early 1980s. And while Mysterio may have claimed the MCU was Earth 616 in Spider-Man: Far From Home, the fact that his whole story was a sham removes any validity to his assertion.
(full article)
https://screenrant.com/what-if-brad-winderbaum-mcu-comics-sotry-explained/
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