Ask HN: What was your best passive income in 2018?
I built <a href="https://dependabot.com" rel="nofollow">https://dependabot.com</a> to be passive, but ended up going full time on it (the startup I was working on feel through). Generates $9k/month passively, but I put my full-time energy into growing it (adding new languages / improving support for existing ones).