Android became a lost cause the second they introduced hardware remote attestation.

Even if there was a way to install your own software, there's no point in doing so. You're "tampering" with the device. Fail attestation and you're untrusted. You get banned from everything. If you hack, you're ostracized from digital society. You're a second class citizen. Can't communicate. Can't bank. Can't stream. Can't play video games. Can't do pretty much anything.

That's the future of Android. GrapheneOS is quite literally the last hope for Android, and only because by some miracle there are companies out there who started trusting Graphene's attestation keys. If that hope ever dies then we might as well buy iPhones.