Enterprise doesn't buy chat/meeting products without PSTN interop (dial-in dial-out to traditional phone line). Discord would probably need to double their dev team to add PSTN.

Building something like Slack or Teams to the level that a F500 company would make it their primary videoconferencing solution is a multi-thousand-employee project. It's not a little skunkworks project for 15-20 people in some corner of the office.

That's why TFA is hilariously flawed. When Altman says "tell us what we should build, we'll probably build it!", he's talking about driveways and backyard pools, not the Golden Gate Bridge. It's like asking mall Santa for a summer home in the Hamptons.