[deniszgonjanin]

I had built a couple of Shopify apps early on that ended up generating about ~4k/month, and I ended up selling them for seed money for my next adventure.

It's a nice way to make passive income, but I wouldn't try to make a business out of it. Remember you are still on somebody else's platform, playing by their rules. It's fairly easy to have the rug pulled out from under you, so don't put all your eggs in that basket.