I'm not sure if I completely understand your question, but this is what I think you're asking: if you wrote the stories then you can publish them. They are yours. Someone actually did exactly this, publishing their /r/WritingPrompts stories on Amazon.
Edit: also, there are a lot of authors that have published books that expanded on prompt responses.
Rex Electi is a book she wrote based on a prompt here on reddit. There's also Prompt Me which is a collection of short stories from writing prompts. Here's her author page on Amazon.
Personal stuff about me. Where I live, my name, etc.
> PS I read you're stuff all the time, it's always good time! The one that's sticking with me right now is that super hero/super villain couple, that one is adorable.
I love that one too. As I just mentioned in another comment, there's another part to it in my book [Prompt Me] where the couple has a race around the world.
I'm not sure if I completely understand your question, but this is what I think you're asking: if you wrote the stories then you can publish them. They are yours. Someone actually did exactly this, publishing their /r/WritingPrompts stories on Amazon.
Edit: also, there are a lot of authors that have published books that expanded on prompt responses.
Luna Lovewell self published a book on Amazon - a compilation of the short stories that she has posted to Reddit.
http://smile.amazon.com/Prompt-Me-W-P-Kimball-ebook/dp/B014S7TDIK
Rex Electi is a book she wrote based on a prompt here on reddit. There's also Prompt Me which is a collection of short stories from writing prompts. Here's her author page on Amazon.
"[Prompt Me]".
> What is the almost? What won't you answer?
Personal stuff about me. Where I live, my name, etc.
> PS I read you're stuff all the time, it's always good time! The one that's sticking with me right now is that super hero/super villain couple, that one is adorable.
I love that one too. As I just mentioned in another comment, there's another part to it in my book [Prompt Me] where the couple has a race around the world.