I should had addressed this post originally in my last response. Yes, riot.im would had been a great choice, and there are a lot of users on it but the issue with using a service that's less popular is less potential reach. The truth is it honestly doesn't matter how closed-source and insecure a platform is, people will keep using it if it's what everybody else is using.
You could purge Google services from an Android handset, but the moment somebody signs into Google whatever bets on device security are tossed. Same for Facebook, same for Twittter even. And almost everybody with a computer uses at least one of those brands, through a multitude of services they provide. Especially in work, where an establishment may rely on any one of them.
Alongside Canonical bedding in with Microsoft and Microsoft shaking the right hands to get in The Linux Foundation, and with how much funded corporate interest there is with our "Open" platform, you have a multitude of organizations who don't necessarily prioritize privacy on their own platforms committing their effort to improve and iterate on our beloved kernel which gives this system life. (Not to mention, the variety of security issues they encountered along the way themselves.)
While I agree Discord isn't the best choice from a security perspective, I also believe we're far past the point when we should have been giving a rip about it. I've practically given up my privacy, having resigned it the moment I started using a bank to manage my money and yield my identity to the United States government (especially for things like, say, voting). I revoked every bit of personal privacy I had then, short of sharing my naked body with any corporate interest.
...Oh, and Discord also has two-hundred and thirty-million users, as exhibited in the video above which was shared in this thread. So yes, @Wimpy has finally conceded and is bringing his water where the horses are, rather than pleading for the horses to come for his drink.