Stable income: Somewhat stable

Customer chat support as a side hustle can offer a moderately stable income source for most people who try it. Based on online research and personal experience, individuals can earn a decent baseline income, but there may be periods of unpredictability. While some months can be consistent, others may experience fluctuations. Therefore, if your best friend quit their job to do this full-time, I would say it's a risk. I'd rate it a 3 out of 5 because while there is a decent baseline income, the reliability can vary, making it less stable than a traditional job.