To open the car with an app (programming against Bluetooth is harder than calling a web API), or honk the horn if you lost it in a large parking lot.
> And how you're not required to sign at least 10 forms to confirm you understand that ALL of your travel data will be recorded and distributed at will.
Legally speaking, I believe that depends on your local privacy laws. Practically speaking, car makers (and government agencies) love these features for troubleshooting and tech support, or for flagging crashes before any authorities or local press have time to arrive (think Tesla).
Don't ask them about finding your stolen car, though. Then the data may suddenly not be available.