Over the last decade, Discord has become the de facto community space for gaming, and there are a lot of huge servers out there that you can find by scrolling through its public servers page. But starting on November 16, some messages in these huge servers will be viewable from Google.
When I got Discord in 2020, everything about the UI made me think this was a private place with the people on the server. Boy oh boy was I wrong. I use Matrix now for actual gaming and hanging out with friends.
I only maintain my Discord to get updates in big organizations, like union organizing. But even those organizations should think about migrating to Matrix or something similar as soon as possible.