Does this eBook downloading thing affect the rest of the Archive? Like, will the entire archive be affected or just the OpenLibrary part of the Archive?

They actually made a custom operating system, because Qualcomm dropped support for the SoC. Source: https://www.fairphone.com/en/2021/03/25/android9-fairphone2/

They did it twice; once for the upgrade to Android 9 (took 18 months) and once for the upgrade to android 10 (took 10 months)

The Fairphone 2 actually had 7 years of security updates before the support was withdrawn, so it’s pretty likely the Fairphone 3 will last at least 7 years, maybe even longer.

Yeah, but Fairphone decided to make their own drivers after Qualcomm stopped with supporting the chips.