Yes phones need to have at least these requirements to fullfill GrapheneOS standards:

https://grapheneos.org/faq#future-devices

Yes GrapheneOS only supports pixel devices, as these are the only phones that have a high enough security standard.

https://grapheneos.org/faq#future-devices

.tar.zst

People should stop using .tar.gz or .zip

They both are not horribly bad, but .tar.zst is just the best option we have, as zstandard is pareto optimal

https://insanity.industries/post/pareto-optimal-compression/

Linux

I use arch btw

GrapheneOS

GrapheneOS is the best android custom ROM by far. It is more secure, it gets updated very often and security patches land on my phone faster than I hear about them. It is way more performant than the default ROM that ships with Pixel Phones, my battery lasts for days if I don’t use the phone.

At first I was very sceptical, as I want to be sure I can rely on my phone. But it is super stable, way better than the Samsung ROM I had before.

Ooh I found it a bit confusing as I collapse comments very often, and it looked similar to it

https://www.vandelaydesign.com/green-websites/

Those are green websites /s

When was this?