I was ne'er married to Google software so Grapheme is like running a custom ROM 10 years ago but a bit more flexible because the Aurora store exists now.
I don't game so I have no real experience there but I've been successfully using Linux on and of since around '05
I don't but its been posted a couple of times on Mastodon, I assume its on their blog and in their forms too.
The jist is Fairphone doesn't have the security HW to run it