The Fairphone team has tried to help with mainline Linux support: https://wiki.postmarketos.org/wiki/Fairphone_(Gen._6)_(fairphone-fp6)

It’s been fine for me

You’re more likely to get a price like that in CEX or Back market, with the added bonus that it’s ethical to reuse second hand.

I’m okay with the camera on the 6, but no it’s not as good as a Pixel, nor does it open and take pictures as quickly.

If it has an AMD GPU you can just install it now, no waiting. But it’s not good at much more than just playing games, if you want a more general purpose machine I’d install something mainstream like Mint, Ubuntu or Fedora.

Not sure Servo will ever be usable. Is it still in active development?