The password to the account has been lost but @bateske, me, and a few others have admin or collaborator rights, and can still modify the Arduboy library repository. I made a fork because no one could agree on how to proceed with the Arduboy library, mainly to address the problem of taking over the timer interrupts for sound, which would break backwards compatibility.
My providing a separate, non-conflicting, Arduboy2 library allowed existing sketches to continue to use the existing Arduboy library, without breaking, then switch to Arduboy2 at their leisure if desired. Since there wasn’t any great disadvantage to using my library instead of the original, and many advantages, many new sketches started using it, to the point that it became the de facto, then recommended, library.
If you read the end of my announcement of Arduboy2, you’ll see (strike out added later) that I offered to make Arduboy2 “official”; hosted and maintained in the Arduboy account, but no one took me up on the offer after a long period, so I just decided to continue to maintain it under my own account, and publish it in the Arduino Library Manager at that location.