As per https://blog.gtk.org/2024/01/28/new-renderers-for-gtk/ and https://www.phoronix.com/news/GTK-4.16-Released :

You can still use either a new OpenGL renderer or the old OpenGL renderer. This can be set with the GSK_RENDERER environment variable (e.g. GSK_RENDERER=gl)

This email explains it in detail: http://lists.busybox.net/pipermail/busybox/2010-December/074114.html

TLDR: /usr stands for user

/srv stands probably for serve as in serving static files like static websites. (Source)

More information here: https://refspecs.linuxfoundation.org/FHS_3.0/fhs/index.html

I’d just like to interject for a moment. What you’re refering to as Taste, is in fact, Nutrition/Taste, or as I’ve recently taken to calling it, Nutrition plus Taste. Taste is not an operating system unto itself, but rather another free component of a fully functioning Nutrition system.