I think ultimately you're getting to the _why_ of the equation - there is a big desire to keep you, the customer, within the app rather than let you abandon the feed. Going back from a note to scrolling through Twitter is easier than jumping back from your browser app to the Twitter app.
I haven't had issues with link previews on my own content, but that very well could be the case for other sites.
I haven't had issues with link previews on my own content, but that very well could be the case for other sites.