Instead, I installed CalyxOS and have been using it over a year now and I'm very happy with it. Check it out.
You have to be aware that you give that person root when you use Graphene. All possible technical improvements aside this is a very big risk. He claimed he would step back after the video released, then called that a lie and continued with everything.
Calyx seems to be the best alternative right now without such a risk factor.
At the time, Rossmann was mainly using GOS, but due to what he perceived as hostile behavior from GOS toward him through their communication, he opted to stop using GOS (at least on his main device, as he claims).
His rationale was that the behavior of said lead developer was not "rational" and "scary", and since the developer has not only edit access to GOS code but also update publishing infrastructure, Rossmann's data or himself could be targeted through malicious code pushed via an update, for example. While GOS is opensource and malicious code or exploits could be detected by the community, he himself did not have confidence to audit the source code to make sure it was safe, hence his decision to stop using.
By risk factor, I think the grandparent suggests that something similar could happen to someone else using GOS, the risk factor being essentially at the mercy of GOS developer, would they wish to harm said user.
if (user is rossmann) {
// do bad things
makes me think who is paranoid here.
Rossmann himself has no confidence to audit the code, so why take the risk ? Good enough reason to be "paranoid", or at least feel uneasy about it if you ask me.
GOS doesn't use an account, so the code would have to perform very targeted heuristics in order to verify this is Luis' phone. It would have to compare his sim number against a known one, or dig into application data to find his logins and compare them against known emails. So the only way to not write `if (user is rossmann)` would be to send various diagnostics over the wire, to a service that contains these identifiers and perform the comparison onlinr, meaning he would introduce an imense security whole into everyone's phone, and everyone would see there is a home calling.
So it's either a patch of if user == rossmann, or a home calling patch.
I don't have to elaborate techniques. If a determined (and potentially mentally unstable) developer decides to leverage their full control over the OS to make it happen can. I don't have to elaborate on the techniques which might or might not exist yet. Stuxnet only targeted specific Iranian systems, a needle in a hay stack, was spread did not harm random devices across the globe, and stayed mostly undetected. And this was done without "developer access" to the software itself. Is it hard ? Yes. Is it likely (especially given the knowledge of how GOS works) ? Perhaps not. Is it impossible ? Definitely not.
When the lead dev of the OS you use daily threatens to "publicly expose you" as a user, I won't blame said user to stop using the software. And even less, to provide such data point regarding the behavior of that developer.