Awesome summary. It seems to me that this is a bit of a failure of the fair use doctrine. Making one preview of an image or article does not impact the author's monetisation ability. Making a business out of systematically producing previews (and adding your own ads around them) should no longer quality as fair use.
We have a joke:
A: How much is a drop of gas?
B: A drop of gas? Well, zero!
A: One million drops of gas, please.