

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.
In a sense, you are hosting the content. You’re retaining a copy (so long as the window is open) and constantly attempting to spread it. It’s literally built on bittorrent protocols if I remember correctly, and it’s already very well established that you can be held responsible for seeding copyright infringing material, so I see no reason at all they’d give you a pass for CP instead. You may not intend to, but remember, my example was someone who looks of age but is not.