Specifically, about how many "stars" on Github would such an open source project need to start realistically thinking about turning it into a lifestyle business, since GH stars are probably the most prominent quantitative indicator I know of in this area.
I've got an open source project that has grown fast with relatively little promotion. I know that a good number of companies are using it in production. I also know of a good way to monetize it, while keeping the existing software exactly like it is (not "open core" but somewhat related).
Is this a pipe dream, or do I have a realistic chance into making this a lifestyle business that -- with hard work -- can start providing a reasonable income (say $100,000/yr) within a year or two?
Story time: 2 years ago I started to learn frontend web development from various online courses. I had zero technical background and no intention to make money. Within few months I learned enough to create my first WordPress theme. It was terrible but it worked . I made few more themes and never did anything with them. I made like 6 themes and just deleted theme few months down the road. Then I decided to submit one theme on WordPress.org just to see if it gets approved. Themes goes through review and someone would evaluate my code and that's what I was after. Long story short my themes now have been downloaded over 1,000,000 times and I have turned it into 6 figure a year business.
While I haven't sold a single theme yet, apparently you can recommend hosting and premium plugins that goes along with your themes and make a decent income.
For those interested you can visit site at: https://colorlib.com/