The interface seemed to function as normal, but specifically the API was targeted, which left a lot of confused users who were seeing the interface peppered with errors. Watching as it unfolded, it seems it affected certain regions to begin with and then slowly spread worldwide.

Seems they might have failed to host the status page (https://status.bsky.app) separately as well, because that went down several times throughout the outage. They also weren't very active in updating the status page, and the notice that was there had a typo of 'reginos' and a description of 'null'.

The status page seems hosted by UptimeRobot, so it looks like it was a problem on their end.