Cocks. I don't like to see them.
Anything that plays at being gross. Like ass eating. Talking about family members. Like this girl really doesn't want to mess with her father or her brother, but Game of Thrones was huge so everyone wants to play into it. Kills the mood instantly. Just not into it. Even if it's two chicks, if they're pretending to be sisters or mother/daughter, it just kills it. Most people aren't into that for real, but "I wouldn't want to bang my sister but I want to watch you bang yours... to me it's the same.
Anything that plays at it being an ad. Teasing. Reference to commercial sites. "Only Fans." Back in the day, we kind of had a renaissance. Anyone with a camera could upload. Yeah occasionally you got teenagers doing dumb shit and if you suspected it, you didn't look at that. But a lot of college age couples were just having fun, fooling around, good times. A lot of those videos aren't in anything close to HD though, but are still worth watching from time to time.
TL;DR they want to control the experience, they don't want you to feel like you have to "jump in" to CarPlay, and they don't want it to be the same as on every other vehicle.
My takeaway: they want to put ads in it. "Increase value to our consumers" or some other horseshit you use CarPlay to get away from. Oh, and never update it.