I would love to begin using this system, but the licensing is giving me serious pause. While most of the software is under the AGPLv3, the Commercial License section of the README [0] implies that the company takes on a fairly broad interpretation of the AGPL.

In particular, the line "[...] to build a feature on top of Windmill, to comply with AGPLv3 your product must be AGPLv3 [...]" seems to imply the company aligns with the stance taken by Google and other companies: that even calling the application via API is enough to trigger copyleft [1].

This implies that if I were to build a sign-up form that triggers a Windmill workflow in the backend, my entire application would either need to be AGPLv3 or I would need a commercial license.

That's perfectly reasonable, as it means any non-AGPL use will have to contribute back to Windmill via a commercial license. However, it does mean positioning this as an "Fully Open-source" alternative to Airflow is only technically correct. This is much closer in practice to "source available" than how most developers would think as "open source".

If this isn't how Windmill wants their license interpreted, I highly encourage clarifying things.

[0] https://github.com/windmill-labs/windmill#commercial-license

[1] https://opensource.google/documentation/reference/using/agpl...