Thoughts
I think people really don't appreciate how well Discord operates at scale. ZSF Zulip has a channel for CI notifications that I have muted.
When I open zsf.zulipchat.com, the backend serializes the ids of all 49,000 message that have been sent in that channel as part of the initial web request. If I click on the notifications channel, the client starts sending off on fetch request for each of those 49,000 messages, causing me to get rate-limited (429 Too Many Requests) after less than 200, completely breaking the application.