Plebbit doesn’t support media or images, only text. If a user links to an image they have to provide the URL, which is never hosted on the community owner’s node. Also, if somebody posts an illegal link or something like that the community owner can choose to purge their comment from their node.

Plebbit nodes are very cheap and easy to run, we’re very similar to Bittorrent in that regard. The next update we will have full p2p capabilities in mobile as well.