"Sony doesn't need Disney."
I hear this every time and yet Sony makes the deals with Disney. If the leaked emails are anything, they didn't know how to handle Peter Parker. Amy Pascal is also riding the coattails of Marvel Studios. It's obvious in the interview with Kevin Feige and other interviews/tweets where they claim Venom and other movies are "tangential" to the MCU.
That's not to say Disney isn't greedy, it's fairly obvious it is - look at how many spin offs they're trying to spawn.