Blocking screenshots, probably the most useless feel good security measure ever.
As the poster a bit above me also noted.
The part in the article "Unfortunately, Signal doesn't allow group moderators to block individuals from taking screenshots, which would frustrate the process of leaking a conversation to the press." is kind of laughably stupid... What self respecting leaker doesn't have at least one burner phone that can take pictures of the screen on another phone? I mean you do use a separate phone for the leaking stuff to others right?