Here is also an interesting article series, about the actual status of de-googled ROMs. Sometimes there are still sone missing blobs.

It is actually written in German but definitively a recommended series:

https://www.kuketz-blog.de/android-grapheneos-calyxos-und-co-unter-der-lupe-custom-roms-teil1/

https://www.kuketz-blog.de/calyxos-de-googled-geht-anders-custom-roms-teil2/