Using something like PeerTube is potentially even worse because let’s say you unknowingly open a video where someone in it looks of age but technically isn’t. You as a user help propagate that content while you have it open. You’re not just downloading illegal content at that point. You’re actively sharing it to new people.
The problem with the federated model for porn is that it’s easier to get away with hosting illegal content.
Using something like PeerTube is potentially even worse because let’s say you unknowingly open a video where someone in it looks of age but technically isn’t. You as a user help propagate that content while you have it open. You’re not just downloading illegal content at that point. You’re actively sharing it to new people.