I think it’s about how Discord sends their updates, not sure tho.
If you want to install the desktop version of Discord I’d advice to install the flatpak. And if you don’t want to install it system-wide you can install it on one user only. That’s what I do anyway.
I think that when the funder is the State, laws make that a bit more difficult than when it’s completely private. Although it doesn’t completely solve that problem ofc.