There are lots of market forces pulling towards proprietary. Most people don't care about software freedom - they want shiny toys right now. Jobs, Gates, Ballmer and Ellison cater to them. They build and sell tools to help you lock yourself to their software. And they even use free software for that.
edit: dear downmodder: try harder. I am sure you can articulate a useful argument instead of just downvoting a comment you disagree with. This should be a place for debating ideas.