Have you heard of @danb's https://isitreallyfoss.com/ ?
It evaluates if software is truly Free and Open Source - not just in license, but in practice. It checks for proprietary dependencies, build transparency, and whether users can actually compile from source.
This matters because true software freedom means you can run, study, modify, and distribute without barriers.
Castopod isn't listed yet, so we've opened an issue: https://codeberg.org/danb/isitreallyfoss/issues/132
Feel free to comment with your thoughts! 💬