Account sharing has become a pervasive issue affecting various industries, notably streaming services, where it results in significant revenue loss and potential security breaches. A study shows that 74% of Americans share passwords for at least one online account, increasing the risk of account takeovers and exposing personal data to unauthorized users. Companies like Netflix, Amazon, and Spotify have started implementing measures to combat this, such as limiting the number of users per account and using GPS data verification, though these methods have limitations. Beyond streaming, account sharing also impacts sectors like healthcare and gaming, where it can lead to breaches of confidentiality and skewed business metrics. Solutions include adopting multi-factor authentication and employing device identification technologies to better track and manage user accounts. Despite efforts to curb this practice, the challenge remains due to the complexity of enforcing policies without negatively impacting the user experience.