I worked at an open source startup once.
I was -shocked- to repeatedly run into the misconception that because the code was open source, anything -using- the code was open source.<p>I saw several potential sales get tanked because the customer had an advisor who believed that if they used open source to develop their website, they would no longer own the content. For example, a furniture company thought they would lose control of their pictures of the furniture. Another blog style site thought they would lose control of the blog posts they wrote. Literally, I am not making this up. It's like believing that Microsoft owns your document because you wrote it in Word.<p>No amount of discussion, examples, or logic would dissuade them. I can't imagine how this idea survives, but I saw it as recently as a month ago in a comment here on HN (which of course I can't find right now), so it's not completely isolated.<p>I'm not sure open source was a net win for the startup I worked at. Due to complicating some sales and assisting a few competitors, it wasn't a clean slam dunk.