To be fair: I don't think it is unreasonable to show a notification to make drivers aware of this offer. But it most certainly should not appear when driving, or get in the way. I would be okay with it if the screen showed a simple message: "Hey, you can use SiriusXM for 2 weeks, on us", when starting the car, and only once.
Other than that I would want an anti-enshittification law: the number and timing of ads on owned equipment and any online servces required to enjoy the equipment, and the available functions on that equipment or associated services, shall not significantly change after the service or equipment is purchased, unless a full refund is offered.