Most noticeable on Daring Fireball on the iPhone app. This means for that blog, Newsblur is merely a notification that I should visit the website in Safari.
It’s a per-feed setting that isn’t in the per-feed setting screen.
For anybody coming to this thread, it was about the Text view versus the Story view on the iOS app. I wrote on Twitter that it’s a per-feed setting where the original story text is downloaded. But it is worth pointing out that while it can be frustrating, the button is prominent and shows on every story, so it is intended to be discoverable and thus far is used by the majority of iOS users.