Its call developer option, this option in settings+about phone+ software then clicking untiit turned you into a developer, based on cyber security test this option turned your device into untraceable.
What if the person is kidnapped and only phone can be used to trace the person? Although, it is possible that the kidnappers will know and throw his phone somehow far away from where they took him.
Also it is worth knowing that it may be untraceable to the government but it is traceable by malware. And if the person make a mistake, it might cost him his coins.
Kidnappers can easily trace someone offline. Privacy is better.
While having that option on my apps use to send me a warning of the vulnerability of my device, so a guess there is risk of malware attacks on the device if is on developers mode