As of this writing, it is all still deriving and getting into the system, but 2 Player Productions has chosen to put 4k versions of the Double Fine PsychOdyssey (and 1080p version) on Internet Archive. Also, archival versions of their previous documentary AND the bonus footage AND deleted scenes of the previous documentary.
Obviously, for most, the Youtube channel where they've released the 32 (!!) part documentary will suffice and do the job, but the Internet Archive is there to ensure it lasts longer beyond that, AND is downloadable for people at 4k for the future.