The No Way Home mid-credits scene reveals that Venom, played by Sony’s Marvel Universe Tom Hardy, also infiltrated the current Marvel 616 Universe as a result of the spell. The main reveal was when we found out that when he came back, he left a little piece of Venom here in the main MCU timeline.
The black suit

Spider Man gets his black suit in Secret Wars
In Avengers: Secret Wars, Tom Holland could possess this symbiote similar to Sam Raimi’s Spider-Man 3 according to this new theory. It will also result in a film adaptation of Spider-Man’s Secret Wars comic book arc. We’ve already established that the clash of universes will be present in Secret Wars. As a result, after No Way Home, there’s a good chance OG spideys Tobey Maguire and Andrew Garfield Peter Parkers will make another appearance in the main timeline.
When the other Spider-Men reappear, it will also ensure that if Tom Holland’s Peter Parker is corrupted by the symbiote, the other Spider-Men, especially Tobey Maguire’s Peter, will try to warn him of the repercussions. It could also lead to a big scene, seeing the Spider-Men fighting each other, which would be completely different from what we saw in Spider-Man No Way Home.
How the Black Suit Was Introduced in the Comics

First appearance of the black suit in the comics
Marvel Superheroes Secret Wars began as a crossover event in 1984, bringing together a variety of Marvel heroes and villains as they traveled to the planet Battleworld after being transferred there by the supernatural known as The Beyonder. Many of the Avengers, X-Men, and many stand-alone heroes have fought against villains, including Doctor Doom, Kang the Conqueror, Doctor Octopus, Absorbing Man, and Ultron.
On Battleworld, Spider-suit Man’s was badly damaged during the war. A black bubble that Peter Parker had mistaken for a fabric-creating machine suddenly bursts from it, coating it in a strange slime substance. To his surprise, the slime began to take the form of a brand new costume, giving rise to the well-known and beloved Symbiote costume.
Spider-Man’s future in the MCU

MCU Spider-Man 4
Kevin Feige acknowledged that Peter Parker is now mostly a street-level superhero following the previous adventure. We’ll see more of Tom Holland in the MCU, though the next Spider-Man movie remains a mystery to us. No live updates have yet been revealed, despite Disney+ announcing the Freshman Year animated series. It’s worth remembering that Sony is the source of announcements for the Spider-Man movies, so it’ll be worth watching for any developments from them.