I watched a friend’s teenage son play a couple of times. They don’t seem to play battle royale or any kind of competitive mode anymore, they just chat and dick around in what seems to be seasonal levels. Reminds me of my WoW days where I logged in to do my dailies more for the social engagement than the actual gameplay.
The point is also to minimize potential damages caused by a bug in the software. Just this year there have been multiple data-destroying bugs in publicly released software. If the app runs as a server it’s usually trivial to have it run as a dedicated user, with just enough permissions to do its job.
It’s just good practice, even though the risks might be low why risk it at all?