Discord is one of the most popular chat platforms. Imagine IRC, but more modern and the developers actually care about UX.
Discord's dark & light themes are too hard on my eyes. They feel like the designers have never worked on a 13" MBP and only large monitors w/ non-retina displays.
I don't find the service very trustworthy, but I think that if you're a gamer, it may work out just fine for you.
If you ever want to resume your communities elsewhere, perhaps check out Matrix (https://matrix.org/)? If you have the know how to host your own server, you can host a community without the risk of being shut down by an external party. People from other servers can still join because the network is federated.
FML.