[eterm]

It can be an effect of "Karma Racing".

Duplicate submissions count as an upvote to the original post.

If you have a source which is known is being popular by the community (i.e. stripe), then there is a race to submit that article to reap the karma of submitting that article.

That race causes duplicates which in turn increases the karma for posting that article first and pushes it to the front-page where it will get even more karma.

That causes a positive feedback loop which keeps that source popular as a source with which to "karma race", regardless of the post quality being sustained.

In this case I haven't read the post itself, so it may be of good quality, but it is a manner in which posts from certain sources quickly reach the front page seemingly without much community interaction.