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What I read of the developer's blog suggests that it does. In addition to the resolution of various vulnerabilities, web standards are constantly changing and updating, and curl has to keep up, which is pretty hard part-time.

Mature doesn't mean it's static.

I suggest scrolling through his blog a bit: https://daniel.haxx.se/blog/

Doesn't need a full time dev.

Needs a part time dev, part time QA engineer, part time product manager, part time tech writer, and a part time solutions architect for downstream and upstream.