Dropbox and Instagram use mypy/typing actively. Also among open-source: https://github.com/home-assistant/home-assistant https://github.com/home-assistant/home-

Dropbox and Instagram use mypy/typing actively. Also among open-source: https://github.com/home-assistant/home-assistant https://github.com/home-assistant/home-assistant https://github.com/mitmproxy/mitmproxy https://github.com/mitmproxy/mitmproxy https://github.com/sphinx-doc/sphinx https://github.com/sphinx-doc/sphinx I would say the opposite, it is not very useful for small projects.