Anyway, HipChat was bought and killed by Slack. They avoided a dying product by accident.
At any rate HipChat was already dead prior to the sale. Atlassian made a new program from scratch called Stride which was its own little awful can of worms.
Build it, and they will come ... and do something you hadn't planned for.
> It was like 25k people in a single room iirc.
This never happened. I literally could not have happened. Uber ditched Hipchat when it was around 10k employees. The largest rooms I ever saw were outages or eng rooms with a few thousand, most with the room muted unless they needed something.
Seeing this behavior was as easy as doing a join in mysql for user ids and rooms. I mean it's likely you wouldn't have seen it, or the room, or had knowledge of it unless you weren't directly involved with whatever it was?
Most open-source and commercial software advertise that they can scale, but throw the first 500 or 5000 users and it's breaking apart.