@stovis
Linux includes binary blobs, obfuscated code, and code released under proprietary licenses, which makes it partially proprietary software and therefore not completely free. Unfortunately, postmarketOS uses this kernel, which means it cannot be considered free software, as it violates freedom 1. Additionally, it does not comply with the definition of open source, as it does not respect its second principle. Furthermore, postmarketOS also includes proprietary applications, such as Firefox, and encourages users to install more applications of this type.

https://postmarketos.org/edge/2024/02/15/default-nonfree-fw/
Remember that firmware is software.