You can buy used Pixels, e.g. from 8a up. I'd claim that this is much more ecological than buying a new Fairphone. I suppose that a Pixel is of a higher quality and has less defects than a Fairphone (which changed the ODM several times). --

This said, I would never use /e/ and Murena as I read too many things I don't like.

You are trusting that your used Pixel doesn't have some non-removable rootkit installed... depending on source, and if that's even possible I don't know but I am suspect of random used hardware on FB or eBay.