Barely. It was originally a XFree86 project called XDarwin, adopted by Apple as a beta release for Jagwire in 2002, was an optional install in Panther and Tiger, default install in Leopard~Lion, and then was abandoned again in favor of the community-supported XQuartz after 2011:
https://xonx.sourceforge.net/ “XFree86, a free implementation of the X Window System, has been ported to Darwin and Mac OS X. […] Our work has been included in Apple's X11 for Mac OS X. ”
Actually that's an interesting question; why didn't Android use X11? A few minutes of web searching don't seem to turn up anybody commenting on it; do you happen to know how I would check what their reasons were?
If I see another one of these insane "explainations", I'm gonna have a stroke. Nokia - dominating the mobile phone market for years - is evidence that Europeans are just fundamentally incapable of innovation!
Nokia boomers squandered the opportunity they had with Maemo and kept insisting on the sinking ship (or burning platform) of Symbian
But to be really honest Maemo was also a dud. Because they didn't have the sharp focus of Android and kept a lot of crap from Linux (like X11 sigh)