Cell phones are the most stolen item in the US, probably the world. The vast majority of cell phone users have sensitive information on their phones they wouldn't want stolen. For these reasons Google made Android a very secure OS and locked it down with factory reset Protection 5 plus years ago. Once an account us logged onto a device the device is locked to that account until the owner removes it.
I worked for Verizon, we couldn't take returns or accept trade ins unless they had the Google account removed because if they were tied to the account they were worthless. Think about that, a corporation like Verizon can't even reset a phone.