It still limits their movements, so her phone would still be on the ground as Junko tries to pull it, and when she tries to take it, she gets bone'd to death.
They clearly were, that's how the fell in despair instead of being just sad.
Also
Paralysis Inducement, Mind Manipulation and Morality Manipulation via despair video (Leaking it on the Internet drove a large amount of people to become anarchists that tore down any buildings, killed people with glee and replaced famous buildings with one's themed after Monokuma and Junko. Made class 77 willing to kill themselves to be possessed by her AI, as well as making them psychotic)
Is done with indirect ways, not a direct hax normally, so she'd need prep to be like Ryota.