Feels like a lot of apps that launch these days have an open source core app and a subscription based platform.

The subscription based platform with automatic cloud hosting and other quality of life features, whatever those are depending on the app.

Although there's a bunch of 100% open source projects and developers that get enough donations to make it their full time job just off of that. Not that it's the way to go if you want to get rich, but it's still very much a real thing.