Starlink is solely owned and operated by Subaru. That's one step in security. Non Subaru dealers selling Subaru's cannot open a Starlink account. A buyer would have to either go online or to Subaru to open a Starlink account. Security. The following info are security steps to ensure you and only you are the Starlink account holder to your Subaru.
Setting up a new Starlink account requires these security steps; vehicle title in your name, your name that's on the vehicle registration, VIN, your home or business address, city, state, zip code, email address, and cellular number. While not obvious, supplied info separates you from anyone else attempting to open a Starlink account without all the info needed. When a used Subaru is bought and the Starlink account to it wasn't closed, registering for a new account may present problems until vehicle title and state registration validates you as the new owner in order to open a Starlink account.
Once a Starlink account is opened, downloading the MySubaru app to phones, pc, tablet, is your business as you become the gate keeper to who uses your MySubaru app to; remote start, preset hvac settings, run time, locate vehicle if a family member uses your Subaru, receive alerts to doors unlocked/ajar, check engine error codes, and a few other things. If your Subaru is stolen, using your MySubaru app will show you where the vehicle is. If you're familiar with LoJack, MySubaru is similar to locating your vehicle whether it's stolen or on the other side of town when your family took it or friend borrowed it and you're curious where your car is.