Not always. Consider two scenarios: (1) adding a feature to an existing product that the company sells. (example: writing a better grammar checker for MS word).

Not always. Consider two scenarios: (1) adding a feature to an existing product that the company sells. (example: writing a better grammar checker for MS word). (2) contracting with the developer of a small open source embedded database to add a specific SQL feature that you wanted to use in your web backend.