People run around with smartphones, everyone needs to register at their residency address, most people casually pay by card/phone literally everywhere, e.g. you could tell how much they drunk on a Friday night and in what bar, but oh boy, no, no, no, lemmy needs to pay for car 20k in cash, so the car salesman could cheat on taxes.
Signal just somehow forgets to store your IP address. So, their response will be “here are our logs, that phone number last time logged in yesterday, that’s all we got”
https://signal.org/bigbrother/northern-california-order/