Same issue here: Mojang logo, white screen, then crashes out to home. Started on an iPad (iOS 9.3.5, Model MC989LL/A) over the summer (which would have been prior to v1.13, no?), but not a huge issue - we just focused on the iPhone. Well, now the iPhone is exhibiting the same problem (iOS 10.3.3, Model MGF02LL/A). Not 100% sure what prompted this. One day it was working fine, and the next, not. Tried rebooting, resetting, reinstalling. Nothing works.
Done