It is definitely tempting to add some kind of check to see how much people read before letting them respond.
There’s two cases
- How much of the original article did you read?
- How many of the other comments did you read?
Of those two, failing to read the original article is worse, but posting a duplicate of another comment is also not great.
(We should also be warning / reminding people if they are posting a link that has already been posted in the topic, too. That’s on our list.)