I live in a big city in the center. When i activate "Show bluetooth devices without names" in the developer settings of my android 13 phone, there appear loads of this devices. I have no clue what they are. Does anyone know? Are that the bluetooth nanobots of the vaxxinated people? (/s to last question!)
Yes, it is turned on by default. You can opt-out if you'd like. Here's a pretty good article that covers it all: https://www.howtogeek.com/725842/what-is-apples-find-my-network/
Samsung SmartTags "Find" network is opt-in, which stagnated the growth of their network.
Tile's network is naturally opt-in as it requires us to install the app, and therefore has the lowest coverage from my understanding.
I recall seeing the following approximate numbers:
Battery and data usage are negligible.