Is there a privacy-friendly mobile OS?

I stumbled on to /e/ some time ago (when it was announced and when they announced pre-installed refurbished phones with /e/), but took another look today after the launch of Android 10. In my opinion Android’s development is very worrying as it get’s more coupled to Google with every release. I don’t like iOS either, because its a completely walled garden. /e/ tries to provide help to completely break free from Google by not only offering an alternative smartphone OS, but also alternative hosted services like email, cloud storage etc.

Google Alternatives for More Privacy and Less Monopoly

I hope I don’t have to explain why Google is bad, but just to give a few reasons to switch to alternatives: You’ll probably get better privacy because those alternatives collect less data about you, your data won’t get sold to advertisers or government organizations that easily and you help to prevent a monopoly. Sometimes alternatives are also just better than the Google product and don’t lock you in so much.
It’s 2018. Long gone are the days where Holo UI is the current design language for Android apps, Material Design is everywhere since 2015. But one of my favorite and most used apps still uses Holo UI… It’s almost 4 years since Google introduced Material Design at the Google I/O 2014 and I still remember it being a revolution. After some years of Holo UI everywhere Material Design came with a new and more modern design approach of simple but more realistic user interfaces focused on differentiating UI elements with shadows etc.
At the beginning of December 2017 I wrote that I will buy the Xiaomi Mi A1 when it finally gets the update to Oreo. That’s exactly what I did. I’ve been using it for over 24 hours now, so my first impressions here: Fingerprint sensors are awesome! The Android and iOS world has had the option to unlock the mobile phone via fingerprint for years now, but only recently the whole thing has entered the budget area, which is why this is also my first mobile phone, which I can unlock with my fingerprint.
I’ve been in the Android scene a little longer already. Maybe not as long as some others, but Android 4.0 was the first version I used. A lot of time has passed since then. But when I look back in time today, it strikes me that one thing that had found many followers at the time is no longer really important. Where are the Custom ROMs gone? When I got my first smartphone, I quickly realized what custom ROMs are and what they’re good for, but only after a while when I found out that I can root my phone without unlocking the bootloader and without losing my guarantee, I decided to try it myself.