ISO 26262 does have serious lifecycle standards but again it’s a voluntary industry standard that has no government oversight or regulatory authority. Oversight is typically largely internal and is strongest in the auto parts/components market. It’s largely toothless to automakers/integrators and again the likes of Tesla simply don’t use it and have no obligation to.
The infotainment system itself may be QM but there has to be assurance that it is in fact separated from higher safety level system.