What kind of "choice" exists between open and closed source?
Everything you can do with closed source software you can also do with open, and there are things you can't do with closed source.
Everything you can do with closed source software you can also do with open, and there are things you can't do with closed source.
This is just not true. Show me a completely open source smart phone... thing is you can't, the baseband and radio will always for sure be closed source. There are markets where having knowledge that your competition doesn't is vital to success, that is why some things will always be closed source.
StackOverflow is an example of why the choice is beneficial. The source code being proprietary is irrelevant because the content is Creative Commons.
You can use it, or you can not.