Updated an ipad mini, 2 I believe, to ios 9.3.5 and the youtube icon disappeared. Now, I couldn't care less - as I don't use it, however, this is the end of the world for daughter #2... *rolleyes*
I find it under 'bought' apps in the app store, but hitting open - or anything else for that matter, does the combined sum of feck all.. I've fiddled about in the restrictions and made sure that the 'apps' section is at 17+, which, apparently, youtube requires.
Uhm.. halp!