Have you checked out matrix? Kbin chat is #kbin:matrix.org
Reddit Migration
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the dev here is very busy as it is and I can't imagine chatrooms are a priority. though there's already federated chatroom options like matrix.
People used the Reddit chat?
I tried for a hot minute over COVID, and it was buggy as hell, but overall, a fun and active environment before they scrapped it.
Could use the microblog section for a more public(?) version of that. idk I never used the chat
Have you tried joining a discord server? That may be more of what you’re looking for.
Discord is a proprietary technology, which can go the way of Reddit at any moment. Discord 'servers' may feel like something self-hosted by the 'owners', but there are not much more independent from Discord as individual subreddits are from Reddit.
I've been part of Discord for a long time, but it feels like there aren't many general chat options, they're all based around a thing I'm not familiar with and don't like. And then so many servers seem to be children.