The challenges of being a FOSS maintainer: https://feaneron.com/2019/03/28/on-being-a-free-software-maintainer/
I can relate. Working on projects with a small userbase that target other devs definitely helps. I'd be reluctant to maintain a popular consumer app.
miniblog.
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Are there any FOSS licensees that explicitly allow people to train AI models on the source code?
This seems like a useful addition, and there's already precedent with the "classpath exception" for the GPL.
On the different funding and maintainership models in FOSS:
I recently bought a bangle.js and I'm really impressed. On the first day I had a JS REPL running with their hello world!
The firmware is FOSS but you write JS apps on top. It's really hard to break. There's already an 'app store' too.

