It truly baffles me how teachers could morally justify that. I would immediately think “Wait, if I make my students buy my textbook for the unit, I’m just fleecing them and they have no choice in the matter.” and you would naively hope that anyone else would also feel the same way.
This might be for the better, but Discord was so infuriating about updates and forcing you to download them what felt like 50% of the time I opened it, I gave up and just use it in Ungoogled Chromium now. I’m pretty sure within a few months I ended up having 15+ debs of Discord in my Downloads folder.
For anyone else trying to use the native Discord app on Debian, I think they’ll find this a major treat.