Most of them aren’t profitable, especially twitter and reddit. YouTube is also doing it now, they’re going after adblocks. They even threatened invidious recently.
But tbh discord change is for good. It’s easier to invite someone, especially if they have special chars in nickname.
I use Gitea as project hosting and personal wiki. I also host Nextcloud for files and news and Jellyfin for movies and music.
In this order.