Per their regular newsletter, Freedom is again able to “block apps, including Instagram and Facebook” on iOS. For the background, see “Daily Gleanings (8 May 2019).”
I’ve yet to see any updates about what has changed from Apple’s side to allow Freedom to again block iOS apps. But the re-opening of this feature is certainly to be welcomed for iOS users who want to use freedom to help cut distractions from their mobile device(s).
For more information or to try Freedom, see their website.