Can someone please add a (2018) in the title :-)
OK font, pointless website and not a smart choice of name, when we hear Plex the thing that comes to mind is the Plex streaming/home DLNA software [0] we all know.
Well to be honest, the first thing that comes in my mind is the PLEX programming language [1] for Ericsson telephone exchanges, that I know and have used in the past.
[0] https://www.plex.tv/ [1] https://en.wikipedia.org/wiki/PLEX_(programming_language)