Games vs general use. By targeting gamers Discord is able to customize the experience to make it better for games.

Kind of like Twitch vs Youtube even

Exactly.

Marketing.

The incredibly slick ease of use/user onboarding doesn't hurt either.

why do people always push matrix on ycombinator when other companies launch their own chat products?

when there is an equally good x in open source, why would anyone use closed sourced alternative?

Is it not a valid question?

If it is the marketing, service of support then let me know.