There are also various reports of things like running e.g. Fedora on an FP6, https://www.notebookcheck.net/Fairphone-6-turns-into-a-Linux... or Debian on FP4/5, but those generally aren't something that is usable due to lacking support for basic things like calls.
Fairphone have just announced direct sales within the past week or so (noted by others here).
Edit:
> With One UI 8, Samsung removed the OEM-unlocking capability globally,
> Samsung uses a physical Knox Warranty Bit/e-fuse. Loading unofficial software can permanently trip it.
This seems far worse than google releasing source slowly
A partnership was announced earlier this year, but no devices will be delivered until 2027.
See: <https://grapheneos.social/@GrapheneOS/117078064184215730>.