The recency bias here is thick! Let's rewind a bit to the 80s and 90s to extend the scope of the fatigue:

OpenLook (closed-source 1980s Unix desktop)

The Open Group (oligarchy of Unix vendors organized around a proprietary standard)

X/Open, Open Software Foundation (OSF) (Groups that merged to form The Open Group)

OpenStep (Proprietary software covered by a commercial EULA from NeXT)

OpenGL, OpenMAX, ...

You've inherited OpenFatigue from your dad!

More:

In the Lisp world, Open Genera.

OpenDOC, OpenVMS, OpenType, ...