It was an April Fools joke, and they didn’t actually post X rated content.
However, to the best of my understanding people who subscribe to someone on OnlyFans can send messages that include photos. So Madison’s claims of being forced to deal with the sexual content sent in by trolls would be plausible.
Currently jailbreak is possible if you have firmware 9.0.0 and below, to my understanding. You can look up videos, but most people recommend text guides as they are easier to update and keep current. For PS4 it matters less since nothing has changed since the current jailbreak released.