Root on computers is insecure. Malware can steal secrets from other applications. We're just used to it, but the Android security model is much better.
It used to be really good, and then it went to a subscription model, with a lot of back-and-forth uncertainty about the change. I suspect the rating reflects that.
Because that would be pointless. If you have use-after-free exploit mitigations active, apps can test for its presence by simply trying to use after free. The only way to make the mitigation unnoticeable would be disabling it.
Nethack has been widely used to test reinforcement learning agents, starting from at least 2020; there was a Nethack challenge at NeurIPS 2021. https://nethackchallenge.com/report.html
Instructions to fully reproduce a build are here: https://grapheneos.org/build#reproducible-builds (disclaimer: I never tried using them).
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