Now forget all of that, because none of it is in Venom the movie. Why not? It has to do with the very same deal between Sony and Marvel that allows Spider-Man to swing into the occasional Marvel Studios movie.
Back in the '90s, Marvel licensed the rights of various superhero properties out to different studios like Sony and Fox, the deal being: As long as those studios kept paying a fee to Marvel for the rights to make movies about its characters, Marvel couldn't take them back. That's why we've gotten so many Fantastic 4 films over the years, each one somehow worse than the last. After the formation of Marvel Studios in the mid-2000s, the company did the impossible with the Avengers -- introducing the public to B- and C-level superheroes most of us had never even heard of, and swiftly making them household names, with the help of its $4 billion dollar acquisition by Disney. Everything owned by Marvel Studios (the Avengers, Agents of S.H.I.E.L.D., everything under Netflix's and, soon, Disney's streaming banner) exists in the Marvel Universe. The X-Men and the Fantastic 4 are off in their own 20th Century Fox universes, and Spider-Man, until recently, was all by his lonesome over at Sony.
Then came the unprecedented deal in 2015 between Marvel Studios and Sony for shared custody over Spider-Man, a coveted property with more name-recognition than any of the Avengers 10 years ago, rebooting the superhero after Sony's The Amazing Spider-Man flops and integrating him into the Marvel Cinematic Universe, first as a cameo in Captain America: Civil War. With this deal, Marvel Studios got the ability to add in whatever it likes from the Spider-Man universe (and merchandise it) into the MCU, but Sony remained the primary owner. That's why you see the Marvel Studios AND the Sony logos at the start of Spider-Man: Homecoming, and why other Marvel movies like Black Panther and Thor: Ragnarok are available on Netflix, but Spider-Man: Homecoming isn't.