One unexplored aspect might be the difference between medias allowing upvotes and the others : I would expect that in the first ones, readers are going to feel

One unexplored aspect might be the difference between medias allowing upvotes and the others : I would expect that in the first ones, readers are going to feel that they did a good enough job of being supportive by just leaving an upvote ? (Even worse for medias not allowing downvotes but still comments : now the only way to signal negative feedback is to leave a full-blown comment!)