Stable income: Somewhat stable

Based on online reviews and my own research, the Etsy SEO listings optimization side hustle can provide a moderately stable income for most people who try it. While there are fluctuations in earnings, many individuals are able to consistently earn from this opportunity. If your best friend quit their job to pursue this full-time, I would say it's a moderate risk but with potential for decent baseline income. I'd rate it a 3 out of 5 because it offers reliable income for the most part, although there might be some variability in earnings.