For instance Chrome and Internet Explorer are both proprietary applications. And before you get on me about Chrome not being proprietary I wouldn't consider any program which includes non-free bits free software.
Who cares? Even Firefox is developed by a tight group of developers who can pour anything in the absolutely massive codebase. I don't think there is any practical difference between free and non-free. That something is proprietary does not automatically mean that the makers want to screw you. I don't know why that attitude is so widespread in Slashdot. Both parties, free and non-free, strive to create a product that works for the users.