This Sony deal has to be turning into such a headache for Marvel Studios.
The question is basically whether now they're going to have to actively supervise this Venom film as an in-house project at Sony that's taking place in the MCU. If not, Sony basically can choose to do what they like within the MCU with these particular films without Marvel's say, which is totally going to ruin Marvel's studious approach to continuity, as well as the way all their creatives like to closely collaborate with each other to make sure none of their individual stories end up contradicting something else within the universe.
It's basically like a group of children playing with their Marvel action figures in a carefully constructed play-time scenario, and then the weird kid from next door turning up with their Venom doll and being all like "I WANNA PLAY! SO LIKE, MY VENOM TURNS UP AND THEN..." and the rest of the kids all rolling their eyes and trying their best to be accommodating, but really wishing the kid would just go away and stop ruining things for everyone else.