The UI is awful, Discord volume isn't exposed, no option to do it, either, so you have to adjust game audio or individual user audio. They put the whole kitchen sink in, for some reason, too, there's a text chat in the voice rooms that needs to be user-revealed for some reason, instead of being exposed by default. Most of it is unintuitive at first use.

Then there's the many contraindications e.g. privacy policy, walled garden, and the dog shit internal indexing and the fact that it isn't externally indexed, there's a lot of pertinent information on there from skilled individuals that could serve society a la the BBS era that will never be surfaced again because it's now being posted to Discord, though that's tangential. I hate it, but it's easy enough to use, though negligibly dofferent compared to Skype, which had many of the same issues.

I think the biggest attractor for my friends was being able to idle in a server so it was easy to start a party vs starting a call on Skype which requires a little more arrangement. Lower cost less friction.

I don't remember marketing, though.