There there, go buy one when you next need.

(links are in french but you surely haven't searched at all before spreading hate in capital letters)

to Install e/OS/: https://forum.fairphone.com/t/a-safe-guide-to-install-e-os-on-your-fairphone/128019

to install android: https://support.fairphone.com/hc/en-us/articles/18896094650513-How-to-manually-install-Android-on-your-Fairphone

Unlock the bootloader https://www.fairphone.com/fr/bootloader-unlocking-code-for-fairphone

I'm in the embedded market and have kept my first FP3 8 years it was pretty outdated technically but its fairness is intact (in fact it's still in use).

It is not a FOSS hardware indeed, it isn't like a samsung either, it is I think the top of the game among existing consumer solutions.