Which of the following is NOT a common helpful purpose of a webpage?

The purpose of a webpage encompasses various objectives that can contribute positively to user experience and information dissemination. The correct answer emphasizes that playing online casino games is not typically considered a common helpful purpose of a webpage.

When assessing the other options, sharing personal opinions allows for individual expression and can foster community discussions, thereby providing valuable insights and perspectives. Selling products or services is a fundamental purpose for many business-oriented websites, facilitating commerce and enabling consumers to access goods conveniently. Allowing user file sharing supports collaboration and resource distribution, contributing to knowledge sharing among users.

In contrast, while playing online casino games may provide entertainment, it does not align with the broader educational, informative, or service-driven objectives that webpages are often created to achieve. Hence, the identification of online casino gaming as less aligned with helpful purposes reflects an understanding of common web functionalities focused on user benefit and utility.