my guess, probably lesser.
people carry their phones as an extension of themselves, while cars takes us from point a to b.
And most modern cars have a Secure Gateway[1] that are mostly not connected to internet, that only allow limited NW access for the connected systems to rest of the vehicle (Engine, powertrain, brakes...)
so the possibility of a remote scaled attack is low IMO.
Reprogramming the navigation to take you to the ambush site or sending your route to mossad would be valuable. That’s without even considering the lethal options like disabling breaking, setting lane assist to swerve you into traffic etc
What’s a Tesla 0-day worth I wonder?