/e/ isn't a safe option due to lacking basic privacy/security patches and protections. It's far worse in most ways than using an iPhone. /e/ even sends user data to OpenAI without consent and has other invasive services.
Despite the misleading marketing, /e/ always uses multiple Google services and integrates them into the OS with privileged access unavailable to other services. They automatically download and run Google code with privileged access along with giving privileged access to certain Google apps when they're installed including Android Auto.
Article from Mike Kuketz about /e/ including covering user tracking in their update client, still using Google services with privileged integration into the OS and major delays for important privacy/security patches:
https://kuketz-blog.de/e-datenschutzfreundlich-bedeutet-nicht-zwangslaeufig-sicher-custom-roms-teil6/
Apple and Google both provide support for offline speech-to-text using local models. Apple uses it by default Users can configure it to be fully offline. /e/ sends the user's audio to OpenAI which is hidden away in their terms of service:
https://community.e.foundation/t/voice-to-text-feature-using-open-ai/70509
Information from the founder of the Divested projects:
Issues with /e/: https://codeberg.org/divested-mobile/divestos-website/raw/commit/c7447de50bc8fadd20a30d4cbf1dcd8cf14805a0/static/misc/e.txt
ASB update history: https://web.archive.org/web/20241231003546/https://divestos.org/pages/patch_history
Chromium update history: https://web.archive.org/web/20250119212018/https://divestos.org/misc/ch-dates.txt
Chromium update summary: https://infosec.exchange/@divested/112815308307602739
There's a high quality privacy/security focused comparison between Android-based operating systems at https://eylenburg.github.io/android_comparison.htm. The author has comparisons between a bunch of different types of software and reviews corrections/suggestions from the public including projects covered by it. If there are inaccuracies, users or developers can report them which has resulted in the accuracy being high.
We have our own post about the very misleading marketing for this device and OS:
https://discuss.grapheneos.org/d/24134-devices-lacking-standard-privacysecurity-patches-and-protections-arent-private