There’s two issues here: getting paid to work on a product; using the product yourself. People often do one without much of the other. People dogfooding do both.
For the original question, a survey might want to separate these two. One just says people are working on a product. Why could be any reason, like just making money. People using it, but not paid to, are more valuable as reviewers.
FWIW, the industry term for this is "dogfooding", and it's usually seen as a predictor of high quality tool.