Are there good reasons for someone who publishes a survey to not release their survey questions? I recently came across a survey that claimed to measure how closely a certain group of people adhere to a certain worldview, and I was interested in learning more about it. I emailed them to ask about it, and they autoreplied saying "The survey questions are not publicly available." They also do not publicly outline their "correct" answers for the worldview they wish to test.
My instinct is to think that they're hiding something, but...maybe not. Are there good reasons to withhold the questions and methodology and only release their conclusions? Is it more common to be able to access questions or more common for survey administrators to hold them back?

Of course, the easy answer here (mentioned in the comments) is to assume they're operating in bad faith, and with the subject matter you referenced, that seems especially possible. THAT BEING SAID, I'm a survey researcher with a private firm. Sometimes we don't release our survey questions if they're proprietary. In the example you mentioned, the company might have developed some specialized formula they use to assess worldview and they don't just want to give that away. Generally, I don't find this style of research super ethical or trustworthy, but industry is very different than academia, and when there's money involved you have reasonable incentives to protect how you do your research. An example of this is the Prophet Brand Relevance Index.
