I haven't seen a single person being entitled or saying that they deserved more from Sparrow. People are upset because Sparrow is being abandoned, and "rights" or what you "deserve" has nothing to do with it. Creating a blog post attacking fake "my rights!" arguments is just silly.
I've seen quite a lot of people saying that. The author quotes several in his article. If people were merely upset, that would be one thing. But people are talking as if they deserve updates and new features.
I couldn't find any quotes expecting endless updates without paying more. The author is wrong in his approach either way. Looking at each issue in isolation. He also incorrectly accounts for the cost to the user. It's not just $10. It's also the time invested into learning the software, setting it up, etc.
He also makes a bunch of assumptions (of course they asked google about open sourcing, but google said no for example) and also skips over other serious problems (things sparrow said they were working on for the future).
