MCU mentioned the multi-verse back in the first "Dr. Strange" movie, 2 years before the Spider-Verse movie.
Sony had nothing to do with "NWH", that's like saying if Dr. Strange is in "Venom 3" it's a Marvel movie now.
Saying it's a Sony movie because Sony characters are in it would be like me saying I built a house because I bought the materials.
Feige has been a producer/consultant on like 90% of the Marvel movies, before the MCU even started.
Good or bad, when I say "Marvel movies" I mean movies Marvel Studios had a direct hand in making, from 2008 until now.
I called "Ironman 3" one of the worst movies of all time. It doesn't magically become another studio's movie, because it sucks.
I called "Spider-Verse" a classic. It's a Sony movie, not Marvel.
There is no cherry-picking, I've been very consistent with what I'm saying.
Likewise "Sony let Marvel borrow some characters" doesn't make that a Sony movie, when they had nothing to do with the creative process. By that logic every MCU Spider-Man movie is a Sony movie, because they own the cinematic rights. But nobody in their right mind would argue that, so I don't even know what the disagreement is.
Fred.