cyberax parent
An unofficial build of Android, like Grapheneos. It likely won't be able to install apps from the Play Store, but at that point it might be a blessing.
grapheneOS relies on the goodwill of Google to keep Pixel devices open right?
They are apparently in talks with a vendor to produce official devices. But yeah, the open Android ecosystem is shrinking.
Samsung recently stopped allowing the bootloader unlocking. HTC stopped allowing bootloader unlocking in 2018.
My bet is on Nothingphone or Fairphone remaining open for a while.