Do you use a device with open source Android firmware? What device, which distro and what do you do with it? I have a Samsung tablet with LineageOS and apps from F-Droid. Other than displaying dire warnings about the unlocked bootloader every time it cold boots, It’s great for a “recliner system”: email, Web browsing, E-book reader and MP3 player. What do you have, what do you use it for, and how well does it work for you?
Pixel 6Pro, GrapheneOS. It’s my daily driver and minus battery life (soon to be upgraded) it’s great.
To be pedantic though, Android (AOSP) is open source either way, it’s the Google shit that isn’t. On firmware though, they all have the proprietary blobs in there, no way around that. Same goes for Lineage, as well as Graphene. Only difference with Graphene is there’s a lot more protections in place. But that’s not an option for a Samsung. But Lineage as long as it’s been further De-Googled is fine for a non daily use (phone) device is still pretty descent.