Ah… So not a Samsung thing, but a carrier thing. I should have guessed, carriers are disgusting. Nowadays it’s rare where I live, but not so long ago they even got in the middle of Android updates and replaced the bootlogo with their own branding, I even know of some devices stuck on old Android versions because while the official release is available the carrier never bothered shipping the update.
I also dislike how SIM cards run independent from the main CPU and can spawn their little Java applets whenever they want, my carrier used to randomly display ads as full prompts that got in front of any other app with highest priority using the “SIM toolkit” feature of Android, which you can’t disable. Only stopped after I gave them a call claiming if I see another one of those I’d report them to the consumer rights watchdog from my region.