Stable income: Somewhat stable

As an online course reviewer, the income potential can vary significantly. While some reviewers earn consistently, many experience fluctuations in their earnings due to factors like course popularity and platform changes. Based on online research and my own knowledge, I'd rate this opportunity a 3 out of 5. It offers a decent baseline income, but there can be periods of unreliability. Your best friend might face some risks relying solely on this for income.