Discord did absolutely zero marketing for business purposes. Most people in the industry looking never even heard of them.

Zoom had voip that made WFH easier and far cheaper when it came to businesses needing to find a better solution to Cisco. Zoom video for 1k+ people for big business announcements or major conferences.

Zoom only competition was Cisco and Microsoft Teams. And if your company is using Slack over Teams they ain't going to want to switch.

Krisp the audio thing discord has by default that many people don't even know about. They actually sell themselves as a separate app for businesses to deploy that pairs directly with Zoom.