In technical communities, "premium account cookies" typically refers to the practice of exporting a valid session cookie from a paid (premium) account and sharing it so others can bypass login walls without paying for a subscription While common in 2021 for tools like

None of these involve stealing cookies, and none put your security at risk.

When you sign up for a premium account on a website, you are typically required to provide payment information and create a login username and password. Once you've completed the sign-up process, the website will store a cookie on your device that contains a unique identifier, such as a session ID or a token. This cookie is used to verify your login credentials and grant you access to the premium content.

Method (short)

Using session hijacking to bypass paywalls is a direct violation of almost every website’s Terms of Service