What do you mean? every social media platform has it's own used and popular. You can rival Discord with Telegram as well as majority here have Telegram accounts to boot because everything is being commuted through it.

And this goes with Discord as well, not just in crypto, a lot of industries have been using it for years now. The downside is that since it become so popular, hackers or cyber criminals put their focus on this communication apps. And specially looking for everything including cryptocurrencies.