The so-called $30 battery replacement for iPhone 6s's that Apple offered as a piecemeal due to their shoehorned batterygate controversy caused my phone to eventually die off w/in a year and a half from the battery replacement 🙄🤷🏽♂.
No clue how they're gonna do it but I have done this for rom hacks before. I just put a number in the rom I can check if my stuff ever got leaked. Like 0 would be this person, 1 for the next. Thankfully I never gotten a leak before lol.