Debian developer Simon Josefsson has announced the Debian Libre Live Images project, to allow installing Debian without any non-free software:

Since the 2022 decision on non-free firmware, the official images for bookworm and trixie contains non-free software.

The Debian Libre Live Images project provides Live ISO images for Intel/AMD-compatible 64-bit x86 CPUs (amd64) built without any non-free software, suitable for running and installing Debian. The images are similar to the Debian Live Images...

He does warn that this is a first public release, so there may be problems. See the current list of known issues before trying the images out.