In the US, 80% of the time, it’s installed by the dealer because of the insurance break for vehicle tracking/theft off of the lot, and the device never gets uninstalled once sold. 19% of the time, it’s an automatic dealer installed option, and they slip the price of it into the final sale (along with nitrogen filled tires) with the buyer not even paying attention.
The other 1% would be financial institutions requiring it, but that would only be at the dealerships that are littered with a bunch of big signs that say “bad credit, no credit, no problem”, or “everyone drives away in a new vehicle”.