On iOS, applications can and do install custom fonts for system-wide use, although the installation user experience is pretty bad: http://norbertlindenberg.com/2015/06/installing-fonts-on-ios/index.html
Norbert > On Mar 1, 2017, at 18:43 , Alastair Houghton <alast...@alastairs-place.net> > wrote: […] > (Also, FYI, iOS applications can - and some do - install and use their own > fonts. It’s per-application, though; you can’t install them system-wide.)
