Stable income: Somewhat stable

A Digital Mental Health Support Subscription Service as a side hustle can offer a moderately stable income for most people who try it. Online reviews and experiences suggest that there is a decent baseline of income, but it can be unpredictable at times due to fluctuations in demand. While some months may be similar, others might bring unexpected challenges. Therefore, if your best friend quit their job to pursue this full-time, it would be considered a risk rather than a guaranteed income source. I'd rate it a 2 out of 3 because while it provides some stability, the inconsistency in earnings prevents it from being rated as very stable.