> the former type is all but obliterated now.

Discord is the 9,000lb gorilla of this form of social media, and it's actually quietly one of the largest social platforms on the internet. There's clearly a desire for these kinds of spaces, and Discord seems to be filling it.

While it stinks that it is controlled by one big company, it's quite nice that its communities are invite-only by default and largely moderated by actual flesh-and-blood users. There's no single public shared social space, which means there's no one shared social feed to get hooked on.

Pretty much all of my former IRC/Forum buddies have migrated to Discord, and when the site goes south (not if, it's going to go public eventually, we all know how this story plays out), we expect that we'll be using an alternative that is shaped very much like it, such as Matrix.