Sure they are obviously free to do what ever they want with their products and maybe "pulling the rug under your feet" is a bit dramatic but it is true that the

Sure they are obviously free to do what ever they want with their products and maybe "pulling the rug under your feet" is a bit dramatic but it is true that they are pulling features left and right (not only Reader) that unless it is used by the 80% enough is under hard scrutiny. But if the top 20% which is also the people that are going to help you innovate are getting tired of getting used to a product working in a certain way and then it no longer does they will be wary of being too dependent on products from that company.