You're being heavily downvoted because this instance is "a community of free software and privacy enthusiasts" as the title on the front page suggests, and this in particular is the !opensource@lemmy.ml community. Discord is the complete antithesis of this, as it is a proprietary application locked to a centralized server that also spies on its users.

What is wrong with Discord (Richard Stallman)

Spyware level: Extremely High (Spyware Watchdog)

That being said, there are modern alternatives to IRC, such as Matrix, XMPP, Zulip, Mattermost, or RocketChat. However, I think IRC is fairly good at what it does.

this, it's a cryptomoney scheme. They need to promote Brave in order to increase the value of the cryptomoney token. There's also an affiliate referral link program I've seen spammed a couple of times

Except this isn't a privacy community, this is a FOSS community, and OP mentioned they wanted an app on F-Droid, not anything about privacy.

I believe the idea that "FOSS is only about privacy and nothing else, therefore proprietary apps with no network access are the same as FOSS apps" is absurd and harmful to the free software community, so I downvoted you based on that. Privacy is important but free software is much more than just privacy.

Why advertise proprietary apps in a FOSS community? Especially when there are FOSS options available