Discord's problem isn't it's name. Discord's entire interface is based around gaming. It shows your running game in the UI, it integrates with Steam, etc. It's loading messages are all based on gaming culture.
It just doesn't present itself as something you'd consider for your business.
The problem with Discord isn't the branding, it's the license. Anything you send in Discord can be used for branding material by Discord. Not good for a business.
Good to know. I have some Discord groups and contacts, but I don't spend a lot of time in it. I actually find the playful messages somewhat endearing, but I feel like they'd be better off launching an entirely separate client if they want to appeal to businesses.
Slack has actual administrator tools unlike Discord. Discord very clearly has no interest in the capturing any significant market share in the business space.
There's a bunch of open source projects using it now as well. I have two separate family Discord servers. Quite a few social ones that aren't specifically gaming focused too.
Discord also caters to small-med non-gaming online communities almost by accident because the kinds of moderation features you'd need are the same as if you were a streamer with an audience.
It's not really about the name or the branding but that fact that Discord's primary market and the driving force behind all their features is gaming communities.
Business, for worse, will demand features catered to their workflow.
It just doesn't present itself as something you'd consider for your business.