Wow, that’s fucked up. Sony basically trying to hold them hostage since Sony knows Marvel is positioning Spider-Man to be a major lead in Phase 4. And Marvel doesn’t want to play ball and keep making huge blockbusters for Sony without getting any %
Sony really should give them some minor % of sales considering that without Marvel, Sony won’t make much on Spider-Man anyhow.
But who knows without the details. Maybe Marvel wanted 50% or something and wouldn’t back down.
Reading through the original Sony leaked emails, it really felt like it was Disney who were bending over backwards for Sony. I mean, the deal as it exists is basically: it's Sony's money, it's Sony's marketing, it's Sony's
movie, and Sony can still do whatever they want with the IP (Venom, Venom 2, Mobius the Living Vampire... all non-MCU.) Marvel Studios is only there to actually do the "make a movie" part (because at least Sony acknowledges they fucked up ASM on pretty much every level.)
Marvel wanted a better deal this time (sharing the production budget steals a lot of power from Sony), and probably thought they could get it, cause I mean:
Amazing Spider-Man 1 + 2 $400-523 mil combined budget $1.46 billion gross
Homecoming + Far From Home $335 mil combined budget $1.99 billion gross