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@Silma, we take for granted how easy it NOW is to send and receive encrypted email. Before Protonmail, it was just too much work for novices to manually encrypt messages. The same situation applies to OS forks. The average person will not spend the time studying how to rework their phone, to switch from android to another OS, and ensure it is secure, and functional with plenty of 3rd party apps.

Creating a proprietary OS (even if it is forked from prior open source work) and combining it with a hardware manufacturer, allows Proton to offer a completely secure hardware and software environment, together with a sandbox to use 3rd party apps that wont be allowed to dip into secure apps outside the sandbox. Like a Black Phone for the masses.

Just as Protonmail built on the early work of email encryption, they can build on the early work of OS alternatives, which currently require a lot of consumer education and technical understanding, and come with plenty of limitations. Protonmail is best equipped to make the leap to a fully functional consumer-ready, fully encrypted OS alternative, with dedicated hardware. They have already built (or are already building) the foundational apps, such as email, calendar, secure storage, and could easily, jointly integrate a very private, highly encrypted messaging app, such as Threema, or just use Signal. The secure sandbox environment will be essential for allowing an expanded selection of apps, while restricting their use of location and other tracking methods.

there are already plenty of solutions to move away from google (Lineage, Replicant, and non-android distros), this feels like reinventing the wheel

Their is the ubuntu touch that is not relying on google. They already got three mobile phone supported, and a few other are supported by volunteers.
https://ubuntu-touch.io/

This is difficult to solve.

https://192-168-0-1ip.net/
https://192-168-1-254ip.com/

If we really want to stop allowing our private lives and personal thoughts from being the main source of billions in revenue for g00gle, we must stop relying on g00gle's android OS. Their surveillance is built into every aspect of their operating system; snooping into what we write, who we write to, who we call, everyone in our contact lists, what we schedule with our calendars, and who we share our schedules with, where we are at all times, what routes we take to work, where we sleep, where we shop, every purchase we make, how long we spend in each section of a store, what web pages we visit, what products we look at online...

In line with Protonmail & ProtonVPN goals, to protect privacy for all, let's begin building a unique mobile operating system, with zero reliance on g00gle or android. There are plenty of non g00gle alternative apps to supplement a Proton OS. The operating system can be surrounded by a secure, privacy firewall, and/or install uncertified, insecure apps in a virtual sandbox, limiting access to personal informaion. Let's stop being the prime meat for g00gle's and faceb00k's money-making privacy meat grinders.

*If you make it open source, you would benefit from plenty of help from developers who share our values.