From Revolt Wiki

Octii was a chat platform developed by Innatical[3], a "Silicon Valley tech startup".

Development appeared to continue to progress through to November 2021 but the platform was shut down around August of 2021. Upon asking one of the team members at Innatical, apparently the team restructured[4] which could lead to speculation on why the platform was shut down but there's nothing to back anything up[5], and they plan to bring back Octii in the future but don't provide any specific information about it.